No kidding.
I've been practicing MMA for 6 years now, and boxing for 7 years, so I'll be able to.
And weight training for 4 years, 1m87 for 86 kg.
I've got insane speed, and reflexes identical to my speed. All I have to do is wait for him to charge me, dodge him and give him a good pat on the head. I won't drop him at the slightest mistake, the gorilla is finished. You'll always have a few smart guys around here thinking it's impossible. Nothing's impossible with willpower, folks, and 2) you're not going to do anything with your cowardly body.
Any trained man can take out a gorilla with a knife. Barehanded isn't necessarily more complicated, it just requires technique.