Actually I believe it would be appropriate to say here, since all possible suggestions on how to actually deleted it have already stated with the current info, that you should think about why you want the video deleted.
Does it offend you, claim to false information, or anything of that nature? Are you wanting it deleted for your own reasons, not considering that others might actually like or want to see the video? Or is it just that you lost your password and now you can't take it down? If for either reason 1 or 2, I think the video should be left there. Somebody wanted it up for a reason, to speak their mind. You shouldn't try to take away somebody's right to speak.