What is the ruling on a husband watching a film he made with his wife during intercourse, and is it permissible to analogize this to the permissibility of watching it live?

There is no problem with a husband looking at his wife in any state she may be in. The rule is that whatever part of her body is permissible to touch is permissible to look at. However, there is a difference between seeing the wife’s charms in person and photographing that and keeping the images, as the latter involves several precautions and risks. The issue is not merely the ruling on looking at these recorded videos, but rather the potential risks that may result from it.