There was a guy in Baltimore's Inner Harbor doing exactly that, Donny. Then some guy from the city came up to him and asked for his license to perform outdoors, slapped him with a citation, and he ended up in court paying a pretty hefty fine. Then, when he went to get the license for the City Of Baltimore, they told him it would take 90 days to be approved, IF he were approved, then he could go out and perform as a Busker.
Additionally, I ran into a guy in Key West that tried performing on Malory Square Dock with the Sunset People, they told him to get the Hell off the dock and if he came back, they would toss him and his gear off the dock and into the ocean - and they were dead serious about it.
I don't know how things are like this in Jersey, but I would bet there are some license requirements, and also special permits required to perform outdoors. Just sayin...
One more thing, I just watched that entire performance you posted by Kevin, no one stopped, no one put a dime in the tip basket, but he plays a mean keyboard. Guess he'll have to find another way of putting the kids through college.
Gary