Let me start with a goal:
There is an old picture of a person taken in a specific location.
I would like to take the same picture preserving the same view and the same position of the person on that picture.
My assumption is that it would be easier to do that when I can see the previous picture during the process of making a new one. Going further, it would be even better if the previous picture would be visible in the camera app itself in the background, so I can compare prev picture with the one I'm going to take in a runtime!
Is there any mobile camera app allowing to set a semi-transparent background picture to help to make such a picture?
Are there any other workarounds to archive this goal?