Well, I watched, and it seems very fake. Defninitely looks setup, because 2pac would've either had the people with him beating down the cameraman, or else he would've been walking up and talking to it.
Didn't get any sound though, so don't know what was said (but could tell that the guy in front of the camera at the start is a smuck).
Oh, and the video was so shaky and grainy that it could've easily been a look alike. Remember the thread about the Britney look alike? I don't know about you, but get a grainy video that doesn't ever get a good focus on them and the guy who is the Britney look alike wouldn't be discernible from the real one.