Someone asked in another one of the threads if the camera remote app on the watch allows you to record video.
It doesn't
If you switch to video on the iPhone's camera app, the watch displays a message that says "Video not supported. Switch to Photo."
I found that if I disregarded that message and hit the record button on the iPhone, the watch then displayed "Video capture in progress." with a button reading "End Video".
So you can stop a video recording with the watch app, but you can't start one.
It doesn't
If you switch to video on the iPhone's camera app, the watch displays a message that says "Video not supported. Switch to Photo."

I found that if I disregarded that message and hit the record button on the iPhone, the watch then displayed "Video capture in progress." with a button reading "End Video".

So you can stop a video recording with the watch app, but you can't start one.