I watched the video and didn't see him put his hand directly in front of the muzzle even once. He did have his hand off to one side a couple of times when the magazine wasn't in the gun.
I had an Italian made Pietta PPS-50 .22LR more than 30 years ago that would consistently fire when the trigger was pulled AND when it was released. The dealer/gunsmith who sold it to me gave me a new hammer from the manufacturer that fixed the issue.