I asked “How” they got it.
It was from a building security system. If you view the youtube, it is obvious it was made using a hand-held camera to video a monitor showing video streams from multiple surveillance cameras in separate windows on a single monitor, probably located wherever the building security guard sits. So, more than likely, the leaker is either the guard or one of his buddies.
It's also possible the guard isn't on duty 24 hours, and somebody with after-hours access to the building used the security system to dredge up video recorded earlier. Or maybe the security system can be accessed remotely (becoming common in retail settings where employee theft is a problem).
In any case, this clown is too dumb to be in the House.