Good Day,
as of now because of Nextcloud Talk limitation to handle 10 to 20 participants videoconferencing without HPB
I tested Jitsi and setup our own server with 4core CPU and 5gb meory on Ubuntu 18.04 using their quick install and I successfully create video conference with 10 to 30 participants with good audio and video quality
Inline with this looking forward to consider to integrate Jitsi in Nextcloud
My workaround as of now is created external site for jitsi in NC and open new tab to create meeting room.
Thank You