Apple doesn’t offer the camera as a replaceable unit. Sadly only the full display assembly is offered.
If you can find a broken screen you might be able to salvage the camera from it to put into your display. I’ll worn you this is not something I would attempt for a first time repair, and I wouldn't even try it my self as the risk of failure is very high given the degree of difficulty.
Here’s the guide you’ll need to follow [guide|117328] and here’s the required brain surgery to get to the camera [https://www.youtube.com/watch?v=I_kcMyhwZls&t=446s|MacBook LCD Only Repair Screen Refurbishing]