You might want to learn how a computer boots up from the get go. In a nutshell, BIOS/UEFI (it's firmware code in a CMOS chip) fires off the sequence...
There are a couple of ways to know. The first and most obvious is to look at all the programs that could use the camera. Like a browser or some other...
I saw a 32 Ford Roadster today. It was painted a beautiful yellow and detailed perfectly. It exuded the pride the owner had in owning such a desirous...