Well, I'm sure the internet won't go crazy over this.
It's the latest episode of Rooster Teeth's Immersion series, except they've blended their real-world action with the open-world shenanigans of Fallout 4.
What's particularly cool is the way they have to simulate radiation sickness for Gavin, causing him to fall over, walk into doorways and other hilarious consequences. It seems like a sponsored thing with Bethesda -- there's a note for the Fallout 4 website in the description and at the start of the video.
It's still a really high quality piece of work from the Rooster Teeth crew though and, if you're a Fallout fan, you'll probably get plenty of enjoyment out of it. Especially when they have to trade for goods.
I wonder if Rooster Teeth would ever consider a Director's Cut with just the Go-Pro footage. That'd be incredible (especially from Gavin's perspective when he has the windshield on his head).