Not done it myself but replacing the camera itself should be plug and play. But before you get that far, I recommend some more troubleshooting. Maybe just a loose connection, or maybe the camera is not secured ? https://accessories.volvocars.com/InstallationInstruction/Document/VCC-394789-1/en-us/XC...

Check with your local dealership- I believe there's a known issue that causes the flicker (especially during extreme heat) there's an online filter you can install that supposedly helps.