With some of the higher spec Nokias from HMD people have complained about the ability of the camera to focus when filming video. Sometimes the problem is that the autofocus is hunting around, sometimes its that it's too slow, other times that it seems to just stop working!
I've been reading some articles about some of the older Nokia phones, especially the N8, 808PV and 1020PV. This problem of focus in video has been around for ages and people have often complained about autofocus, so much so that in the N8 Nokia didn't originally have autofocus at all, they used something called "full focus" (I think) which kept everything from ~60cm to infinity in focus. Later they added autofocus only for close-ups. On the 808PV the default was hyperfocal, which has everything from ~30cm to middle distance in focus.
Why can't HMD add these two modes to the camera app for video mode. Let the user choose, like a "pro" mode for video.
To me, this seems like an obvious and easy way to address the autofocus problem.