creenChange = function () {
  if (screenfull.isFullscreen) {
    addClass(this.playerDiv, "fullscreen");
  } else {
    removeClass(this.playerDiv, "fullscreen");
  }
};

VideoPlayer.prototype.initialize = function() {
  var self = this;
  var video = this.video;
  this.scrubTime = null
  var files = video.files;
  var bufferingDetected = null;
  var player = this.player;
  var playerDiv = this.player.parentNode;
  this.playerDiv = playerDiv;
  this.spinner = playerDiv.getElementsByClassName('player-spinner