A system and method for determining relationships between fields of views of surveillance cameras is disclosed. In the system, a user device such as a mobile phone receives image data from the cameras, and an analytics system of the user device analyzes the image data to determine the relationships between the fields of views of the surveillance cameras. The relationships include overlap among fields of view of at least two of the cameras and deadzones, where deadzones are areas monitored by the cameras that are not included within any of the fields of view of any of the cameras. In a preferred embodiment, the surveillance cameras capture image data of a scene while an installer holding the user device walks one or more critical paths through the scene. The user device then analyzes image data from the cameras during the critical path definition to determine any overlap and/or deadzones.