Movie posters with their still images replaced by actual footage by Los Angeles-based Editor/Filmmaker Pablo Eyre. He sourced the images online and cleaned them up in Photoshop before adding the video clips. This type of poster is possible now using a large screen and motion graphics software but you can only display it in a few locations. Hopefully, in the future, somebody will develop a screen that's as thick as paper and can hold a few seconds of video.
See also Henning M. Lederer's animated book covers.