You can buy a license plate frame with the built in sensors which would be the easiest. The sensors aren't too expensive but to install you would have to drill holes in your bumper for an OEM look. My car came with the reverse sensors but no camera which I installed myself. But between the two, the sensors are more useful to me when backing up, especially into the garage.
2014 Grabber Blue Mustang GT Premium with nav, RR and comfy packages, 3.73 limited slip axle and optional 19" machined aluminum wheels
Mods: Boss 302 exhaust with QTP electric cutouts, Borla S-type axle backs, BBK Black Out CAI, aluminum Ford Racing coil covers, Steeda short shifter & bracket, Ford Racing Handling Kit, SHR window louvers