videoView.js

var MediaSourceWrapper = require('foreground/model/mediaSourceWrapper');

var VideoView = Marionette.ItemView.extend({
  el: '#video',

  mediaSourceWrapper: null,
  mediaSourceWrapperEvents: {
    'change:objectURL': '_onMediaSourceWrapperChangeObjectURL'
  },

  initialize: function() {
    this.mediaSourceWrapper = new MediaSourceWrapper();
    this.bindEntityEvents(this.mediaSourceWrapper, this.mediaSourceWrapperEvents);
  },

  _onMediaSourceWrapperChangeObjectURL: function(mediaSourceWrapper, objectURL) {
    this._setVideoSrc(objectURL);
  },

  _setVideoSrc: function(objectURL) {
    var videoSrc = objectURL === null ? '' : objectURL;
    this.el.src = videoSrc;
  }
});