<div class="video-holderYT">

        <iframe width="480" id="ytplayer" height="270" class="videoImageYT" src="https://www.youtube.com/embed/zKtxphNAdEY?rel=0&amp;autoplay=0&amp;modestbranding=1&amp;showinfo=0&amp;autohide=1&version=3&enablejsapi=1&playerapiid=ytplayer" frameborder="0" allowfullscreen=""></iframe>

</div>

<script src="https://code.jquery.com/jquery-3.1.0.js"></script>

<script type="text/javascript">

  var player;

 function onYouTubePlayerAPIReady() {

  player = new YT.Player('ytplayer', {

    events: {

        'onStateChange': showMe

       }

    });

 }

​

 var tag = document.createElement('script');

 tag.src = "https://www.youtube.com/player_api";

 var firstScriptTag = document.getElementsByTagName('script')[0];

 firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

​

 function showMe() {

   var status = player.getPlayerState();

   if(status == 0) alert('ended');

 }

</script>