oh and second thing that I noticed that video-call installer didn't have working aegis manifest, so I did following commands manually on the commandline:
devel-su
/opt/bin/video-call-installer true
chmod 777 /etc/call-ui
chmod 777 /etc/call-ui/callUIVideoButton
/usr/lib/package-manager/reboot.sh

That enabled the video call button on the ui.