When you want a video on your website to play infinite times

you need to adjust the code you get from youtube.

This is the embedded code you get from youtube

<iframe width="560" height="315" src="https://www.youtube.com/embed/pfGYsxpNJKc" frameborder="0" allowfullscreen></iframe>

this code you need to change into:

<iframe width="560" height="315" wmode="transparent" src="//www.youtube.com/embed/pfGYsxpNJKc?loop=1&playlist=pfGYsxpNJKc" frameborder="0" allowfullscreen></iframe>

And your video will play until you hit the stop button.