I would suggest you to fix the existing youtube code. Right now you have it like this:
Code:
<object width="720" height="405"><param name="movie" value="https://youtube.com/v/XXXXXXXX?autoplay=0"></param>
<embed src="https://youtube.com/v/XXXXXXXX?autoplay=0" type="application/x-shockwave-flash" width="720" height="405"></embed></object>
while the proper format is this:
Code:
<iframe src="https://youtube.com/embed/XXXXXXXX" height="405" width="720" allowfullscreen="" frameborder="0"></iframe>
That's why youtube embeds at GFY can not be switched to full screen mode and have a lack of other features.