This system require you to have a video capable deck with rear either backup camera input or a deck with Auxiliary video in.
The way to take dash apart is in the deck install video.
deck: http://www.mazdas247.com/forum/show...all-aftermarket-stereo-on-a-2012-2013-Mazda-5
cameras: http://www.mazdas247.com/forum/show...-surround-view-cameras-on-a-2012-2013-Mazda-5
rear screen: http://www.mazdas247.com/forum/show...w-to-install-rear-screen-in-2012-2013-Mazda-5
rear view camera: http://www.mazdas247.com/forum/show...install-Rear-view-Camera-in-2012-2013-Mazda-5
The way to take dash apart is in the deck install video.
deck: http://www.mazdas247.com/forum/show...all-aftermarket-stereo-on-a-2012-2013-Mazda-5
cameras: http://www.mazdas247.com/forum/show...-surround-view-cameras-on-a-2012-2013-Mazda-5
rear screen: http://www.mazdas247.com/forum/show...w-to-install-rear-screen-in-2012-2013-Mazda-5
rear view camera: http://www.mazdas247.com/forum/show...install-Rear-view-Camera-in-2012-2013-Mazda-5