Install Backup Camera In Rx300 W. Nav Already

[LexKid630]

Just wondering if it was possible to install some kind of backup camera (like on the Rx330/350/400h & LS etc) on an Rx300 that already has navigation?

Is there a way to hook up the camera to the LCD screen so whenever the car is set to R, the image appears on the nav screen?

Also, probably should of asked this first....do they even make backup camera systems that could do this?

Thanks :)