This example is taken directly from the official YouTube Data API documentation, and shows how to perform the following functions:

1. It retrieves the channel name and thumbnail of the authenticated user's channel using the API's channels.list method.
2. It handles the video upload to YouTube using the resumable upload protocol.
3. It polls for the uploaded video's upload and processing status using the API's videos.list method by setting the part parameter value to status.

Using the Javascript Client API:

/*
Copyright 2015 Google Inc. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

var signinCallback = function (result){
  if(result.access_token) {
    var uploadVideo = new UploadVideo();
    uploadVideo.ready(result.access_token);
  }
};

var STATUS_POLLING_INTERVAL_MILLIS = 60 * 1000; // One minute.


/**
 * YouTube video uploader class
 *
 * @constructor
 */
var UploadVideo = function() {
  /**
   * The array of tags for the new YouTube video.
   *
   * @attribute tags
   * @type Array.<string>
   * @default ['google-cors-upload']
   */
  this.tags = ['youtube-cors-upload'];

  /**
   * The numeric YouTube
   * category id.
   *
   * @attribute categoryId
   * @type number
   * @default 22
   */
  this.categoryId = 22;

  /**
   * The id of the new video.
   *
   * @attribute videoId
   * @type string
   * @default ''
   */
  this.videoId = '';

  this.uploadStartTime = 0;
};


UploadVideo.prototype.ready = function(accessToken) {
  this.accessToken = accessToken;
  this.gapi = gapi;
  this.authenticated = true;
  this.gapi.client.request({
    path: '/youtube/v3/channels',
    params: {
      part: 'snippet',
      mine: true
    },
    callback: function(response) {
      if (response.error) {
        console.log(response.error.message);
      } else {
        $('#channel-name').text(response.items[0].snippet.title);
        $('#channel-thumbnail').attr('src', response.items[0].snippet.thumbnails.default.url);

        $('.pre-sign-in').hide();
        $('.post-sign-in').show();
      }
    }.bind(this)
  });
  $('#button').on("click", this.handleUploadClicked.bind(this));
};

/**
 * Uploads a video file to YouTube.
 *
 * @method uploadFile
 * @param {object} file File object corresponding to the video to upload.
 */
UploadVideo.prototype.uploadFile = function(file) {
  var metadata = {
    snippet: {
      title: $('#title').val(),
      description: $('#description').text(),
      tags: this.tags,
      categoryId: this.categoryId
    },
    status: {
      privacyStatus: $('#privacy-status option:selected').text()
    }
  };
  var uploader = new MediaUploader({
    baseUrl: 'https://www.googleapis.com/upload/youtube/v3/videos',
    file: file,
    token: this.accessToken,
    metadata: metadata,
    params: {
      part: Object.keys(metadata).join(',')
    },
    onError: function(data) {
      var message = data;
      // Assuming the error is raised by the YouTube API, data will be
      // a JSON string with error.message set. That may not be the
      // only time onError will be raised, though.
      try {
        var errorResponse = JSON.parse(data);
        message = errorResponse.error.message;
      } finally {
        alert(message);
      }
    }.bind(this),
    onProgress: function(data) {
      var currentTime = Date.now();
      var bytesUploaded = data.loaded;
      var totalBytes = data.total;
      // The times are in millis, so we need to divide by 1000 to get seconds.
      var bytesPerSecond = bytesUploaded / ((currentTime - this.uploadStartTime) / 1000);
      var estimatedSecondsRemaining = (totalBytes - bytesUploaded) / bytesPerSecond;
      var percentageComplete = (bytesUploaded * 100) / totalBytes;

      $('#upload-progress').attr({
        value: bytesUploaded,
        max: totalBytes
      });

      $('#percent-transferred').text(percentageComplete);
      $('#bytes-transferred').text(bytesUploaded);
      $('#total-bytes').text(totalBytes);

      $('.during-upload').show();
    }.bind(this),
    onComplete: function(data) {
      var uploadResponse = JSON.parse(data);
      this.videoId = uploadResponse.id;
      $('#video-id').text(this.videoId);
      $('.post-upload').show();
      this.pollForVideoStatus();
    }.bind(this)
  });
  // This won't correspond to the *exact* start of the upload, but it should be close enough.
  this.uploadStartTime = Date.now();
  uploader.upload();
};

UploadVideo.prototype.handleUploadClicked = function() {
  $('#button').attr('disabled', true);
  this.uploadFile($('#file').get(0).files[0]);
};

UploadVideo.prototype.pollForVideoStatus = function() {
  this.gapi.client.request({
    path: '/youtube/v3/videos',
    params: {
      part: 'status,player',
      id: this.videoId
    },
    callback: function(response) {
      if (response.error) {
        // The status polling failed.
        console.log(response.error.message);
        setTimeout(this.pollForVideoStatus.bind(this), STATUS_POLLING_INTERVAL_MILLIS);
      } else {
        var uploadStatus = response.items[0].status.uploadStatus;
        switch (uploadStatus) {
          // This is a non-final status, so we need to poll again.
          case 'uploaded':
            $('#post-upload-status').append('<li>Upload status: ' + uploadStatus + '</li>');
            setTimeout(this.pollForVideoStatus.bind(this), STATUS_POLLING_INTERVAL_MILLIS);
            break;
          // The video was successfully transcoded and is available.
          case 'processed':
            $('#player').append(response.items[0].player.embedHtml);
            $('#post-upload-status').append('<li>Final status.</li>');
            break;
          // All other statuses indicate a permanent transcoding failure.
          default:
            $('#post-upload-status').append('<li>Transcoding failed.</li>');
            break;
        }
      }
    }.bind(this)
  });
};

The associated HTML, CSS and JavaScript file (defining the MediaUploader class).

A complete Fiddle can be found here. Follow these steps to create a project and replace YOUR_CLIENT_ID_HERE in the Fiddle with the corresponding client id from the project.

Regarding AngularJS, take a look at this question to help you get started building a service for Angular.

In google-api-nodejs-client repo, you have an example of youtube video upload code here with the sample doc here

It uses Youtube insert API used to upload a video to YouTube and sets video's metadata

Here is a minimal functional example (the authorization code need to be set manually in this example) :

var google = require('googleapis');
var util = require('util');
var fs = require('fs');
var http = require('http');
var spawn = require('child_process').spawn;
var querystring = require('querystring');
var url = require('url');

var OAuth2 = google.auth.OAuth2;

var FILENAME = '/home/user/test.mp4';

// get these from https://console.developers.google.com/apis/credentials (don't forget to activate Youtube API)
var YOUR_CLIENT_ID = "XXXXXXXXXXXXXX-XXXXXXXXXXXXXXXXXXXXXXXXXXX.apps.googleusercontent.com";
var YOUR_CLIENT_SECRET = "XXXXX-XXXXXXXXXXXXXXXXXX";
var YOUR_REDIRECT_URL = "https://your-domain/redirect";

var oauth2Client = new OAuth2(
    YOUR_CLIENT_ID,
    YOUR_CLIENT_SECRET,
    YOUR_REDIRECT_URL
);

// initialize the Youtube API library
var youtube = google.youtube({
    version: 'v3',
    auth: oauth2Client
});

// very basic example of uploading a video to youtube
function uploadVideo() {

    var req = youtube.videos.insert({
        part: 'id,snippet,status',
        notifySubscribers: false,
        resource: {
            snippet: {
                title: 'Node.js YouTube Upload Test',
                description: 'Testing YouTube upload via Google APIs Node.js Client'
            },
            status: {
                privacyStatus: 'private'
            }
        },
        media: {
            body: fs.createReadStream(FILENAME)
        }
    }, function(err, data) {
        if (err) {
            console.error('Error: ' + err);
        }
        if (data) {
            console.log(util.inspect(data, false, null));
        }
        process.exit();
    });

    var fileSize = fs.statSync(FILENAME).size;

    // show some progress
    var id = setInterval(function() {
        var uploadedBytes = req.req.connection._bytesDispatched;
        var uploadedMBytes = uploadedBytes / 1000000;
        var progress = uploadedBytes > fileSize ? 100 : (uploadedBytes / fileSize) * 100;
        process.stdout.clearLine();
        process.stdout.cursorTo(0);
        process.stdout.write(uploadedMBytes.toFixed(2) + ' MBs uploaded. ' +
            progress.toFixed(2) + '% completed.');
        if (progress === 100) {
            process.stdout.write('\nDone uploading, waiting for response...\n');
            clearInterval(id);
        }
    }, 250);
}

var scopes = [
    'https://www.googleapis.com/auth/youtube.upload',
    'https://www.googleapis.com/auth/youtube'
];

var authorizeUrl = oauth2Client.generateAuthUrl({
    access_type: 'offline',
    scope: scopes.join(' ')
});

console.log("go to " + authorizeUrl + " to get authorization code");

var AUTHORIZATION_CODE = "X/XXXXXXXXXXXXXXXXXXXXXXX-XXXXXXXX";

oauth2Client.getToken(AUTHORIZATION_CODE, function(err, tokens) {
    // Now tokens contains an access_token and an optional refresh_token. Save them.
    if (!err) {
        oauth2Client.setCredentials(tokens);
        uploadVideo();
    } else {
        console.log(err);
    }
});

If the user get the authorization code with the right channel, the video will be uploaded to that same channel