Security.allowDomain("www.youtube.com");
Security.allowDomain("http://s.ytimg.com");
var videoPlayer:Object;
var loader:Loader = new Loader();
loader.contentLoaderInfo.addEventListener(Event.INIT, onLoaderInit);
loader.load(new URLRequest("http://www.youtube.com/apiplayer?version=3"));
function onLoaderInit(event:Event):void {
addChild(loader);
loader.content.addEventListener ("onReady", onPlayerReady);
}
function onPlayerReady(event:Event):void {
videoPlayer = loader.content;
videoPlayer.setSize(150, 150); //PUT THE DIMENSIONS OF YOUR VIDEO IN THIS LINE
videoPlayer.cueVideoByUrl("www.youtube.com/embed/G0gEfsuXRmU", 0);//PUT YOUR VIDEO URL IN THIS LINE
videoPlayer.playVideo();
}