Почему не работает youtube player?

var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
function stopVideo(id_iframe) {
	document.getElementById('vid_'+id_iframe).contentWindow.postMessage('{"event":"command","func":"stopVideo","args":""}', '*')
}
function init_video(video_id){
	if (player) {
		player.destroy();
	}
	console.log('init start!');
	if(document.getElementById('vid_'+video_id).contentWindow){
		document.getElementById('vid_'+video_id).contentWindow.postMessage('{"event":"command","func":"playVideo","args":""}', '*');
		console.log('postMessage!');
	}
	var player;
	player = new YT.Player('vid_'+video_id, {
		height: '700',
		videoId: video_id,
		playerVars: {
			rel: 0,
			showinfo: 0
		},
		events: {
			'onReady': onPlayerReady,
		}
	});
	if(player){
		console.log(player);
	}
	function onPlayerReady(event) {
		console.log('onPlayerReady');
		event.target.playVideo();
	}
}