You can plainly see the standard Leica script on the top plate, just as they are on stock MP's. And seeing as you can't get an A-la-carte M7 with a MP styled rewind knob, that kinda rules that option out. In the video, you can see that it has an accessory crank attached.
Geeks, are we.
Oh, and the reason why I believed the lens to be a pre-asph Elmarit 28 or a Summicron 28 ASPH is because of 1) the size/profile and both of the lenses are almost identical. 2) But, it's the hood design that is a tell tale sign in this video. And again, both of those lenses had a similar hood. And 3) the image results simply look like a 28 to me, as shooting with anything wider than that at close distance would distort people's faces a bit more than they appear here.
I just got done watching National Treasure. So of course, I'm just having fun sleuthing. It matters little if it's actually right.