* See what you look like in a certain outfit being put through its paces. A stock video of a bride walking down the aisle or dancing in a dress could have the r

* See what you look like in a certain outfit being put through its paces. A stock video of a bride walking down the aisle or dancing in a dress could have the real bride's face put in place so the bride can visualize how she'll look in different situations. * A demo video of what life in a new house would be like. Pre-recorded video featuring actors waking up, eating breakfast, and living life in a home could have the actors replaced with the potential home buyers. * Security tests... for facilities that have to look for "banned" people, occasionally a face could be replaced on the video to see if the security guard notices. This is similar to the TSA sometimes testing workers by putting in fake images of guns or bombs into the X-Ray display to make sure their workers are actually paying attention. * Retroactively correcting visual media that is no longer appropriate. I would love a version of "The Cosby Show" where Bill Cosby was replaced by another famous black actor just because it would trigger my liberal guilt less. This could allow studios to craft contracts where if a star committed a grievous act or if they die, their likeness could be replaced throughout the series and they would stop receiving royalties for their visual appearance. Dialog could be re-dubbed as well to complete the retroactive continuity. * Updating low-res video... If there is a very poor and grainy interview with someone, the image might be able to be enhanced more completely by replacing the subjects face with a higher resolution copy of their own face! * Smart therapy mirrors... people who have had disfigurements or have body image problems could have a smart mirror that displays a modified image for either self-esteem purposes or to help them psychologically. * Same applies for funhouse/haunted house mirrors... seeing a mirror image of yourself with a zombie-ified head would be a great illusion. * Real-world facial masking... You know how people can 3d map the exterior of a building and then project an image onto it using that 3d map taken into account to pull off some spectacular illusions? [1] Something similar, sans holographic technology, could be done to make someone appear like someone else. A camera and 3d scanner environment to track the facial contours and location, with a projector projecting the image of another face onto the real face. Similar to the scene in Bladerunner 2049 where the AI girlfriend rents a real-world avatar for a personal encounter with her boyfriend. [2] [1] https://www.youtube.com/watch?v=XSR0Xady02o https://www.youtube.com/watch?v=XSR0Xady02o [2] https://www.youtube.com/watch?v=VuV2c-6js8w https://www.youtube.com/watch?v=VuV2c-6js8w