That video was flagged and has "been removed because it's content violated Youtube's Terms of Service."
No worries. The video is deleted there, and now the scammer cannot make unlisted or private videos, either.
Their account will most likely be deleted as well.
The chances of them posting it again and sending individually to any of your friends is very low. That is too much work, especially if you did not pay them in the beginning, and blocked them, etc, without another single word to them.
Read our entire topic, "Have been Blackmailed, what do I do?"
viewtopic.php?f=20&t=1242This will help you understand the way these scammers operate and also show that the advice we give victims is correct, and that excess worry is unnecessary.