I can't decide whether that's awesome or the stupidest thing I've seen posted in a long time... I seriously hope there were a great deal of testing, that didn't get shown in the video, before he stood in that thing, with all the fireworks.
And in the same breath, I'd just like to recommend everybody to exercise proper caution around fireworks - IMHO, above video is not an example of that and is something that should only be done by pyrotechnicians, preferably with trained medical staff nearby.
Luckily, I haven't experienced any physical damage from fireworks, but every single year there's stories of at least a few people that has either lost an eye or a finger; it's dangerous stuff. That's why most of it should explode high up in the air.