This actually feels like it could be an incredibly valuable post-production tool in film and TV, once they get it working consistently across multiple frames.
Not only for more flexibility in "uncropping" after shooting (there was a tree/wall in the way), but this could basically be the holy grail solution for converting 4:3 to widescreen without cutting off content on the top and bottom.
The problem I'm solving is converting videos from widescreen to vertical and sometimes you need some extra height.