// 1. Load YouTube Frame API
(function(){ //Closure, to not leak to the scope
  var s = document.createElement("script");
  s.src = "https://www.youtube.com/player_api"; /* Load Player API*/
  var before = document.getElementsByTagName("script")[0];
  before.parentNode.insertBefore(s, before);
})();

var player;

// 2. Event handler
function onPlayerStateChange(e) {
  if ( e.data === YT.PlayerState.PLAYING ) {

    // 2a. stop slider
    $('.blueberry').trigger('blueberry.stop');
  }

  if ( e.data === YT.PlayerState.PAUSED ||
       e.data === YT.PlayerState.ENDED )

    // 2b. start slider
    $('.blueberry').trigger('blueberry.start');
  }
}

// 3. Attach API object to embedded player
function onYouTubePlayerAPIReady(e) {
  player = new YT.Player('myvideo', {
    events: {'onStateChange': onPlayerStateChange}
  });
}