I tried to record video on my Dell G15 laptop using built-in camera. Unfortunately, by default it does not work. I tried Cheese and Webcamoid using several different settings. Cheese did not work with both built-in and external camera. Webcamoid worked with external camera only. Finally I decided to try OBS-STUDIO and still built-in camera was crashing this piece of software also.

To fix this problem you could try to disable AppArmor:

If it is the case, then you can try to find which AppArmor profile is responsible for blocking camera recording. For me, it was the case. Now I can record using built-in camera.