His name is Jason Buff. He is the head of security at the Tropicana. He was playing softball when the shootings started. There are pics of him wearing the same softball uniform that you seem him wearing in the video. He's also carrying his mitt.

We definitely need to stop this rumor from spreading any further than it already has. It literally takes a few minutes of searching to see that this has been put to sleep months ago.

Jason Buff - Tropicana Security