The photo is a Transportation Ministry Youth Activities Church Bus Camera System power connection but this uses a standard public school system bus that was sold to them. The wiring for the 3 power-wire connections is the same across many different applications. Constant power is the Red wire, Ignition-on or Accessory power is Green or Blue, and Chassis ground is Black.

With proper butt connectors, plus a 3-loop wire wrap to prevent wires from being pulled out, and then electrical tape, you have a reasonable, solid connection for the life of the bus.

Other vehicles may use different electrical vehicle wiring configurations, but they will still have the same connection points for the vehicle-to-camera system wiring, as they all incorporate a battery to start them and lights. Therefore, the same 3-wire connections can serve almost all vehicle types, including drastically different applications such as the: