Whenever I service laptops for family members,I always tell them that their cam should always be assumed to be turned ON.
Knowing that,it becomes easier to convince them of the most effective way to ensure their privacy from hacks.
I stick some black insulating tape over the lens on laptops,if they are silly enough to want to talk over the net whilst displaying their funny bits',well, that's up to them & they are also likely to 'forget' to cover it up afterwards.
I have never ever used a web cam for it's intended purpose,I have used a CCD type for astronomy,but I have never ever 'trusted' them or the software.
Considering ALL WINDOWS machines are inherently vulnerable,thanks to Bill GATES,I think it's wiser to just use your mobile phone to communicate,even though HMG snaffel every bit of data for their egocentric paranoia.