. . . or just stop using Zoom and video call your friends and relatives using the 'Meet Now' button at the bottom right of your screen in Windows 10. (It uses Skype but, if you're using a compatible web browser, such as Chrome, you don't even need to have Skype installed).
If you simply want to check that your webcam is working, click here:
https://webcamtests.com/check
If you see an image when you run the test, you'll know that your computer and camera are working fine. So it must be a problem with the Zoom software. (You could try uninstalling, and then reinstalling it).