First you need the brothers to grant you a device to open low grade military boxes. When this is done by playing a few side quests. You can make your way to the location in the video. It is past the graveyard with two large rocks jetting out into the water. You will see a crate which you use the brothers device to open. Inside there will be a blueprint called "Tolga's Folly" Craft it. Equip it and it has an unlimited use unless you drop it. It has a few preset locations which one of them being a scenario from the SAW series. There are humans in hamster wheels being filmed and been strung up. Also there are four paintjobs near dead characters in the factory with Techland shirts. You can't get into this building unless you teleport. But you can leave normally by toggling a red button.