Banksy sells paintings at deep discounts in Central Park

i first thought that if you had a video tape of the whole scene, with the videographer shooting the stall/man in your frame, then you’d probably have the reclusive artist on tape, no? you can’t tell me he’s across town having a sandwich all day, he’s standing right there, ‘anonymously’ watching/selling/performing/recording, drinking a coffee and getting some footage - I’m betting that if this isn’t a hoax, then Banksy’s the cameraman