Header Video

Hi,
I have a question on Header Video. I really love this part, I haven’t install this theme yet, but while I was trying the Preview features, I figured out that we can also post Youtube videos on header section which is really kool.

My question is if there is a way to add sound to the video? I mean when people visit my site, and they see if any trailer or something is playing, they should be able to hear it too. Please let me know, if it’s possible to add sound?

My site: knowledgemasti.com

Thank You
Nik