IGNORE the email. They say they have a video but they do not. I run a mail server, it's a common scam email and they don't have anything.

An excerpt from the last one we filtered:

I've been watching and looking after you for a few weeks already. Facts are you have been poisoned by malware infection coming from pornographic material web page you simply stopped at.

I infected you with a malware a few months back when you visited an adult site, and since then, I have been observing your actions.

The malware gave me full access and control over your system, meaning, I can see everything on your screen, turn on your camera or microphone, and you won't even notice about it.

I also have access to all your contacts.

One of the biggest life lessons to learn is just because someone says something doesn't mean it's true. And scammers will make their email vague enough that it can apply to anyone who looks at internet porn.