I actually know the first guy Marcelo is rolling with in the beginning, he's a member of my team and we've trained together. His name's Pete Roberts, he's the co-owner of Origin (the brand of rash guard he's seen wearing) and also BJJ Weekly, which is where the footage was taken from.
A couple weeks ago at team training, he mentioned after a roll that his arm was still tweaked because of Marcelo, although the submission he caught him in wasn't featured in this video. You can see it starting at 6:38 below, although I'd encourage anyone who hasn't already seen it to watch the entire Rolling Reflections. Pete does an outstanding job narrating the action, and Marcelo also did another Rolling Reflections video with one of his black belts which I'll post below this one:
Pete Roberts rolling with Marcelo Garcia @ his NYC Academy
Marcelo rolling with one of his black belts