It seems that when I try to use www.youtube-nocookie.com url , api doesnt seem to work anymore . Here is the fiddle: https://jsfiddle.net/m2wrujy7/1/
If you remove host parameter then it works.
// 2. This code loads the IFrame Player API code asynchronously.var tag = document.createElement('script');tag.src = "https://www.youtube.com/iframe_api";var firstScriptTag = document.getElementsByTagName('script')[0];firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);// 3. This function creates an <iframe> (and YouTube player)// after the API code downloads.var player;function onYouTubeIframeAPIReady() { player = new YT.Player('player', { height: '390', width: '640', videoId: 'M7lc1UVf-VE', host:'//www.youtube-nocookie.com/', events: {'onReady': onPlayerReady } });}// 4. The API will call this function when the video player is ready.function onPlayerReady(event) { event.target.setVolume(0); event.target.playVideo();}<div id="player"></div>