I've just installed your LineageOS16.0 for the Pi4 (using PINN of course) and successfully installed gapps so that I can install zoom video conferencing from the play store.
Mostly it works quite well (see viewtopic.php?f=63&t=254367&start=25
) but if the main display showing the video is hidden (for example to view the participants or change meeting settings etc.) then the local video tends to freeze when the display returns. The remote video and both audios seem to continue. Restarting the meeting or the App does not restart the video and the Pi needs to be powered down to restart the video. That suggests it could be something to do with the Android
camera driver to me, rather than zoom, but I'm just speculating.
Any ideas? I was using the Pi4 4GB with RPF Camera and a USB sound card (USB 0x8086:0808).