Don't get me wrong: this guy's dogged vocal attack on terrorists -- he yelps commands like "COMPUTER, LEFT CLICK AHHH" to spray his gun in sheer panic -- is a certain sort of impressive. It's just not exactly practical.
GamerMuscle whipped up the video in question, and it's certainly something. He actually gets a few kills in between moments of unbridled, "please zeus strike the masked man before me with lightning because I am wholly unequipped to deal with him myself" terror -- including one that wins his team a round.
If you're for some mad, masochistic reason interested in trying voice-controlled CSGO yourself, here's the program he used to do it. Have... fun?