<script>
    var tag = document.createElement('script');
    tag.src = "https://www.youtube.com/iframe_api";
    var firstScriptTag = document.getElementsByTagName('script')[0];
    firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
    var player;

    function onYouTubeIframeAPIReady() {
     player = new YT.Player('ytplayer', {
      events: {
       'onReady': onPlayerReady
      }
     });
    }

    function onPlayerReady(event) {
     player.mute();
     player.playVideo();
    }
   </script>