That's Joey Gathright, occasional big-league center fielder. He's currently playing with the Royals (of Triple-A Omaha, that is), though the video was taken in 2002, back when he was still a legitimate prospect for the Devil Rays. What went wrong?
Well, he can't hit worth a lick, and he jumped over one more car in this video than he's hit home runs over three seasons. I kind of hope he makes the big show and gets traded to the Phillies, though, if for no other reason than to see him try jumping over Jon Lieber's truck.