I have no idea. Im guessing . The person in the foreground isnt part of the background. Was this done with some sort of chromakey. (* if thats how you spell it)
the background is from old school anthems 12jun05 and the foreground (the chick) is from something we filmed earlier this. things that would give it away, is the lighting doesn't match between the two, as the background pans the foreground doesn't and its a bit out of proportion with other people in the background.