It's a bit like slander, except there is no false information. I wanted to Google whatever this may be called to see what my options are if this video is ever released. I'm stumped as to what to search for though.
A psychopath of a roommate in college has a video of me doing drugs. I wasn't aware there was a video. It was my first and last time trying drugs. I'm about to start my professional career and this degenerate of a man has the power to take everything I've worked for over the past 5 years away with a simple video. My family's reputation, my own reputation, and my professional career are now all at risk because of one stupid mistake I made. It doesn't seem to qualify as slander because I did in fact take drugs.
In Ireland
From this site, it implies that you need consent to photograph people in private. (I assume video is under the same category). Unlike the other answers, this is specifically about "IRELAND".
However, it might be easier just to go to a lawyer. The police might help if he is threatening to release it, assuming releasing it is illegal.
– Programmdude Dec 05 '17 at 09:32