There are a lot of rooms in VR Chat that let you do this, and you can actually meet and interact with people this way pretty readily. The libraries on there are extremely impressive, must be pulling from a torrent repository like a Stremio extension or something. Anyhow, I recommend giving it a try if you don't mind the VR headset resolution. You can of course also run this on a Desktop, which for this purpose has some advantages.
If you are talking about a service/app to match you with people to watch a movie together with in person, you could try MeetUp, or one of the dating apps. Nothing ideal that I know of, honestly would make a decent app idea