You can live with it, or get it repaired. Not sure what the cost is, although the conventional thinking is that it requires Apple's out of warranty replacement price. But it's theoretically possible for just the camera to be repaired, and this support article hints that it can be done.
About genuine iPhone cameras - Apple Support
If you need to replace your iPhone camera, it's important for certified technicians who use genuine Apple camera parts to repair it.
Only technicians who have completed Apple service training and who use Apple genuine parts and tools should replace iPhone cameras. These service providers include: Apple, Apple Authorized Service Providers, or Independent Repair Providers using genuine Apple parts. Replacements not performed by Apple, authorized service providers, or certified technicians might not follow proper safety and repair procedures and could result in improper function or issues with image quality or overall device safety. Apple camera parts are designed to fit precisely within the device. Additionally, repairs that don't properly replace screws or cowlings might leave behind loose parts that could damage the battery, cause overheating, or result in injury.
Depending on your location, you can get your iPhone camera replaced—in or out of warranty—by visiting an Apple Store or Apple Authorized Service Provider, or by shipping your iPhone to an Apple Repair Center. Independent Repair Providers* also offer genuine parts by trained technicians for out-of-warranty camera replacements.
