Looks fake.
His hips move forward as though he is pulling the gun back.
What is the source?
gifbin.com
It’s been around at least a month. A number of shooters saw the same thing you did and think it’s an act. The video quality is not good enough to determine what the rifle is. However, if it is faked, the guy held a rifle so loosely as to allow it to jump when it recoiled and then fired it, simulating the impact. Either way it is remarkably irresponsible.