I'm almost certain that the footage is staged. Otherwise you would hear the terrible whirring of the cameras on the track.
Staged is the wrong word. The footage is most likely from periods where tape was not rolling, yes, but It's not like Carl was pretending to play bass and the mics weren't plugged in. This is a real session.
Plus, while I assume you would hear the camera going, it's possible that it wouldn't be all that loud or even near inaudible if off-mic.