<iframe id="td_youtube_player" src="https://www.youtube.com/embed/uuem3nS3efI?enablejsapi=1&feature=oembed&wmode=opaque&vq=hd720" frameborder="0" allowfullscreen=""></iframe>
<script type="text/javascript">
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("td_youtube_player", {
events: {
"onReady": onPlayerReady
}
});
}

function onPlayerReady(event) {
player.setPlaybackQuality("hd720");
}
</script>