How to mute an Embeded Youtube video.

HTML

<iframe id="ytplayer" width="560" height="315" src="//www.youtube.com/embed/ZvXNWz6qhfM?version=3&loop=1&playlist=cfaE_mcixpQ&autoplay=1&rel=0&showinfo=0&controls=1&autohide=1&iv_load_policy=3&enablejsapi=1" frameborder="0" allowfullscreen></iframe>

JavaScript

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

        tag.src = "//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() {
            player.playVideo();
            // Mute!
            player.mute();
        }