An example player configuration that allows for custom plugin initialization.

config.js

/**
 * The player configuration: 
 */
{
  /* include plugins through the `scripts` property... */
  "scripts": [
    'http://www.londonlive.co.uk/player/plugins/share-panel.js',
    'http://www.londonlive.co.uk/player/plugins/age-gate.js',
    'http://www.londonlive.co.uk/player/plugins/poster.js',
    'http://www.londonlive.co.uk/player/plugins/logo-badge.js',
    'http://players.brightcove.com/videojs-ima3/videojs.ima3.min.js',
    
    /* The HLS plugin is included by default. Without specifying media, it will just sit there waiting 
       to be initialized by the page. */
       
    /* BC analytics is configured by default, so you don't need to add it here. */
  ],
  "stylesheets": [
    "https://players.brightcove.com/videojs-ima3/videojs.ima3.min.css"
  ],
  
  /* Only initialize a subset of the plugins. The others we'll trigger from the embedding page */
  "plugins": [{
    "name": "age-gate"
  }, {
    "name": "logo-badge"
  }, {
    "name": "ima3",
    
    /* You can override the default ad URL by specifying options here. If you need to change the ad tag 
       parameters per-request, you could leave this plugin out and initialize it from the page */
    "options": {
      "serverURL": "http://ads.net/custom?key1=a&key2=b",
      "adSwf": "https://players.brightcove.com/videojs-ima3/VideoJSIMA3.swf"
    }
  }]
  
  /* Note that there is no `media` property, since you'll be handling that through the page */
}


/**
 * On your site, you can manually initialize the rest of the plugins:
 */

var player = videojs('#video-player');
if (useLowResStream) {
  player.hls('http://www.londonlive.co.uk/videos/low.m3u8');
} else {
  player.hls('http://www.londonlive.co.uk/videos/high.m3u8');
}

// we could initialize other plugins that require page interaction here, too:
player.sharePanel('Like us on Facebook!')

/**
 * I would recommend removing the default play button through CSS included before your player 
 * in the page:
 * 
 * .vjs-play-control { display: none; }
 * 
 * If there are issues with that, we could look into exposing the video.js initialization options 
 * to prevent the button from being created to begin with.
 */