It is quite obvious to anyone who has an instructional background he started to do everything he was taught.
Landed a little flat, started to drift to the side of the runway, after reducing throttle, (But may not have closed it fully - possibly causing more drift) doesn't add enough rudder.
So initiates a go around.
Doesn't correct the yaw and then uses aileron to try to steer away from the hangar, while accelerating towards it.
Poor chap becomes completely overloaded and is fortunate that the aircraft hit the hangar side on so the aircraft and the soft skin of the hangar acted as a crumple zone.
This should be seen as a learning exercise for us all not just in the lessons this video shows but also when going around is not the best option and most importantly that the rudder is so seldom used by a huge amount of pilots in GA from beginners to pilots with lots of hours.
Unless pilots have real experience of stick and rudder aircraft and tailwheel aircraft then they see the rudder pedals as brakes and footrests. Rather than a powerful control surface with multiple secondary control effects.
Good luck to the student, I am glad he wasn't too badly hurt, that he provided us all with some valuable learning experience and hope that this doesn't put him off flying.