Not got an 09 but sure ive read cruise is just a matter of fitting stalk and code. Rear camera is easy job but a fiddle. Contact this guy camera comes with parameters already coded without lines can be out of sink.
Contact and ask for your car. Plug and play just routing cables and coding.
https://www.ebay.co.uk/itm/New-Original-Audi-A5-S5-RS5-8W-Q5-SQ5-Rear-View-Camera-8W8827566D-Rfk-Camera-Set/273931736334?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
If your not happy doing your own contact Richard at www.p-d-r.co.uk not all shows on his site but he knows everything.