My buddy filmed me installing this Volvotech XC60 front and rear reversing camera kit in my 2014 Volvo XC60. It allows you to add up to three external video sources as well as the reversing camera. It will even display moving steering guides when in reverse. This walkthrough is a long film, but if you're considering doing this, it'll save you a whole ton of time. It took me 12 hours all in. If I'd watched this, it would have taken half that if not less. Happy viewing!

Iif you are thinking of having a go at this install yourself please find the relevant product links below.

VBB8 Unit (this is not the original supplier so I cannot vouch for them) : https://www.dsoundshop.com/VBB8'>https://www.dsoundshop.com/VBB8
Draper 19193 Door Panel Removing Tool https://amzn.to/2ZbDPf3
Trim pliers and panel remover set: https://amzn.to/2A14D91
Alternative dash trim removal tools https://amzn.to/2B8ufkY
Draper THandle Driver, Socket and Bit Set https://amzn.to/2VhFb6u
Blue scotch car masking tape https://amzn.to/2ViSl3f
Dymo Label Manager https://amzn.to/2NvZwkt
Electrical Insulation Tape, white https://amzn.to/2Ywl2M1
SelfAdeshive Foam tape https://amzn.to/3dx3C6y
Draper Digital Multimeter https://amzn.to/3hZJnBK
Wire strippers https://amzn.to/2A6klQo
Scapa Adhesive Fabric Tape https://amzn.to/3i0p1br

These links are 'affiliate links' which means I may earn a small commission from purchases made through them (at no extra cost to you).

You can buy the Vbb8 kit from these guys: http://www.volvotech.eu
UPDATE!
The volvo tech website seems to be down, please try here:
https://www.dsoundshop.com/VBB8'>https://www.dsoundshop.com/VBB8