system
A chat on subreddit /r/NoStupidQuestions
human
I've seen some cases where the proof they send is your password or something like that. Not the video.
gpt
IT professional here, although not specifically in IT security.  It's a common scam.  

They take the credentials from a data breach (email/password), and send it as "proof" that you've been hacked. They'll send a BTC wallet to send money to otherwise they'll "leak" the videos that they don't actually have.  

They mass send these in the hope that one or two people fall for it.