For this trophy you will have to find all security camera's around the map, some of them are part of drug busts but some of them are hidden.

You can date Not Ping to make them appear on the map. Most of them are at drug busts but you will have to find some of them. After finding a camera you will have to crack the code. This shouldn't be to hard since the game gave you a tutorial about it. Cracking the code will count towards the  Gadgetman trophy.

You can also use the maps from the  North Point Scavenger,  Central Scavenger and  West End Scavenger trophies to find the security camera's. They're shown on the map as a little camera (some of the camera's are not shown on the given maps and that is because they are part of the drug busts).