<iframe width="640" height="360" src="//www.youtube.com/embed/MyXWalwFqyE?feature=player_detailpage" frameborder="0" allowfullscreen></iframe>
I did manage to get it to work. However, there seems to be a browser cache issue, atleast on my development server.
Use either a private window to try it (most browsers support this now.) Or clear your history.