I mean, it's the whole damn concerto! That is a LOT just to memorize all of that, let alone coordinate all that very complex movement to produce a coherent sound... Violin practice must be ALL that kid ever spends his time on, but he does seem to actually enjoy it. He must, otherwise a 7-year-old's attention span simply wouldn't pull it off... that sort of thing takes a tremendous amount of concentration.
Freakin' amazing.