It does look like Hebrew. I speak Hebrew, and I didn't understand a single word of it, which is what made me check out the lyrics. (Yiddish is like a street version of Hebrew, German, and a few other things.)
A side note - there were only men in the video, but it was a wedding. At Hassidic weddings, men and women dance separately, sometimes with a temporary wall in between the two sides of the dance floor, other times, men and women are in separate rooms.