hows this done?

That looks like modeling to me. I’m guessing the characters (Clothes) were probably done in Maya or Max. The animation looks to be motion captured. The compositing of course could be done in Vegas, but you’d need a 3D program and some really good 3D chops to do the characters.
 
I would think that green or blue screening the subjects, have the faces, hands and any other parts covered with the green or blue material and then matte it against the various backgrounds. But then I've been wrong before.
 
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