The cool part is his shadow. Look for that. I'll go with real. And wondering if the rim is set low. But great video either way.
Usually neighborhood streets are about 26-28 feet wide. So he seemed to jump about the center of it which is a 13-14 foot jump, so it's definitely looking real. Plus rim does look set lower. Free throw dunk is 15 feet.
Obviously it's a real video, just based on the shadows. It would be too intricate of a fake job for some kids in the burbs to do, and just not worth the time. But look at how low the rim is. The kid is probably 5'9 or something and he barely needs to jump to dunk here: That being said, I found the dunk to be very aesthetically pleasing. Great extension, clean motions.