I don't know much about this, but I guess it's footage from some event that went down? Either way..
You don't need to know anything about this to enjoy it. Lucas M put this together soo nicely, it looks basically like a jam going down on a really cool park, but just as nice as all the tricks is the way this is filmed and edited - things like the massive film burn and vig gave such a nice effect here. Too good!
Go check Lucas' channel here :)
