This is a LEGO candy machine that the builder created when he was about 12 or 13. I don't know what he's doing now, but if I had to guess, I'd say engineer or inventor (or entrepreneur).
Update: I don't know why I was assuming the video maker was an adult. I looked at his YouTube channel and he's still quite young. I'm sure he has a successful future ahead if he can build something this clever and detailed.