Has anyone tried Jami? I'd like to chip in, but I have literally nobody to use it with so no experience here, maybe it is worth looking into for you OP
I have it working with my family, and ti works quite fine. It's quite easy as well, once the accounts have all been setup...
Setting an account is not hard at all. The complexities come when wanting multiple devices getting in sync. On Android it's been rock solid for some time already. On the GNU+Linux side, depending on the distro, it might have fatal issues, or just work.
Apart from that, take a look at https://bkil.gitlab.io/secuchart/ and user feature (leftmost column) Video calls for messengers with Android F-droid/apk yes.