Stanford University AI researchers have developed software that allows anyone to insert a video or still photo on almost any planar surface in an existing video.

A “3D Surface Tracker Technology” algorithm first analyzes the video, with special attention paid to the section of the scene where the new image will be placed. The color, texture and lighting of the new image are subtly altered to blend in with the surroundings. Shadows seen in the original video will be seen in the added image as well. The result is a photo or video that appears to be an integral part of the original scene, rather than a sticker pasted artificially on the video.

Source: Stanford news release