According to the Youtube site and unconfirmed:
His name is William Eric Houran, a drug addict and a thief which is the common type of people in the so called “free Syrian Army”, that is destroying Syria. Ironically, the West considers these people as the “sole representatives of the Syrian people”.
h/t blazing cat fur and this vid courtesy of @causingfitna
Looks like the same guy from this post, Video: Are Americans fighting alongside jihadists in Syria? And Algeria?