How to change the image in the android camera?

Question

Android

Actually there is a question that when photographing the camera, the picture was shot, say, from the gallery.
A similar example is when in spy films a video camera rotates a small recording recorded in advance in a circle. \
Now the problem is solved in an analog way, the camera takes a printed photo in front of it, I would like a software solution.

Answer 1

Perhaps you need to modify the firmware, the Camera.takePicture method?