Default Embed Code:
<iframe width="500" height="300" src="http://www.youtube.com/embed/{$id}?wmode=opaque" frameborder="0" allowfullscreen></iframe>
Optimized Embed Code:
<iframe width="640" height="390" src="//www.youtube-nocookie.com/embed/{$id}?rel=0&wmode=opaque" frameborder="0"...