You jest, but the industry was pretty close to having something like that. VHS-C format tapes are the key, as they were used in lightweight camcorders back in the 90’s. The viewfinder used an active screen, so this could be used for playback anywhere.

If we ditched the optics and stretch the definition of “pocket”, this is basically that: www.ebay.com/itm/386925509292?chn=ps&mkevt=1&mkci…