My advice, disconnect your camera via the USB socket when you are not using your webcam; or, if its an inbuilt laptop webcam, disable it via your task manager (Cntl-Alt-Delete opens task manager), then disable the webcam by turning off (End Task command) the appropriate background application. If you are not sure, there are lots of advice you can find via Google, for example:
www.howtogeek.com/424862/how-to-see-which-apps-are-using-your-webcam-on-windows-10/.
I started getting emails several months ago saying they had recorded me watching pornography {among other things} and had access to all my email addresses. They said if I didn't sent them £800 they would send recordings of what they suggested I was doing and watching to all my contacts, that included family and friends.
I knew straight away that it was a con because although they had an old password of mine that I'd changed a few years ago (probably lifted from an old game account from an insecure gaming server), there was no way they had done what they said they had done because for one I don't watch pornography online and secondly I always unplug my webcam when not in use. (I only use it when talking to online friends).
I mentioned this to a cousin of mine and he said he'd received exactly the same message. I continued to receive the same email, though with slightly different wording several times until it ended.
I think this scam started shortly after a film had been shown on national TV about a young guy who was doing what these scum had suggested I was doing and had then been blackmailed, (I can't remember the name of the film)