Best Technology for an E-Christmas Get Together?

This Christmas my family plans to hang out in a videoconference while also streaming something we recorded earlier. There seem to be quite a few ways to theoretically achieve this. Looking for advice on a reliable, pain-free method from anyone with experience.

Ideally something that:

- does not require users to sign up, install anything, or a specific OS (for example: go to a custom URL and everything works through the browser without any sort of sign-in)

- allows videoconference-like features

- can stream a pre-recorded video to everyone

- reliable

- minimal setup