Okay, I installed the droid-camres, gstreamer1.0-droid and gstreamer1.0-droid-tools rpms. Then I did 'droid-camres -w' and 'devel-su
mv jolla-camera-hw.txt /etc/dconf/db/vendor.d/
dconf update'
Now, the Mpx has values in the camera app in settings.
However the video recording still doesn't work.