In the above clip, a Chinese gamer ignores several booth companions while he focuses on what looks like side-scrolling role-playing game Zhan Hun (roughly, "Soul Decapitation").
The clip is now going viral, but it's actually from the China Joy expo earlier this year. This is probably a stunt by a game company — however, it could also be some sort of gag a fan did at the show. Or, as the YouTube title hints, a "professional gamer in action". If you do watch the clip, note that, yes, it's kind of tacky! (It's also vaguely reminiscent of this Russian Counter-Strike stripper stunt from a few years back.)
a professional gamer in action [YouTube]