I see that this was posted to YouTube in 2015, but do you know when the actual interview ran? The ending comment of "This was before video games, I don't know how Dungeons and Dragons would run now" seems off. 2015 was before streaming of live play really took off, before the million dollar kickstarters, and before there was a lot of A-list actors other than Vin Diesel talking about it and participating in live streams of the game, including Vin Diesel who played a short session with Critical Role.
But if the question is limited to living celebrities, and if we are limiting this to "Hollywood Celebrities", I would say Vin Diesel. While I don't get the feeling that he is active in the hobby any more, he still has a love for the game and it was a lot of fun seeing him play a short session with the Critical Role folks. Joe Magnaniello would be fun as well, I'm sure.
In terms of celebrity GMs, I would most want to play with Chris Perkins, though Matt Mercer is a very close second.
Joe Magnaniello questioned if Vin Diesel was playing because no-one he knows has played with him. And judging from Diesel's instagram, he's just far more interested in playing DnD with his kids (and friends that are okay with gaming with his kids) than celebrities.
No one really I can think of. I've never had any desire to meet any celebrities that I admired. From what I've hear and read its usually a disappointment. Though I've read some lists online that were pretty interesting of celebrities that play RPGs which admittedly might be fun to watch but I often wonder what some of them are like behind closed doors. I dont think anyone would want to see Mike Myers throw a temper tantrum because his character failed a saving throw.
Better bring your 20-sided Ouija board to pull that one off. If I had to DM for 1980 Robin Williams I think I'd be so traumatized Id have quit for good. I can barely get a word in edge wise with my players now let alone him after a night out with John Belushi and Ace Frehley.