Surveillance Sense is a gear perk that tags surveillance devices near you, such as security cameras. It helps you plan a stealth route through an outpost without being spotted by a camera.
Cameras and other surveillance kit near you get marked. You see where they point and can avoid or destroy them.
Wear the Tactical Headgear in the head slot. Gear perks are fixed to the piece of clothing that carries them, so you get this one by wearing that piece, not by unlocking it in a menu.
Security Expert helps you deal with alarms once you know where the cameras are.