Maybe off topic but I got into a rabbit hole like a year ago with the crazy filtering a bunch of chinese camgirls were using in (apparently) live video.
For the unfamiliar, camgirlfinder matches models by facial similarity across several cam sites so you can track models that change sites or display names. Pretty sure only some of the matches in that link are the same girl, so I think it's a good sample of different women looking the same kind of fake. For maximum effect, turn on the option to show backgrounds.
The tech was fast enough at least to work real-time, but you would notice things like the background distorting, particularly if the model was standing in front of something that's mostly straight lines like a door frame. Also I remember seeing a recording where the filter lost eye tracking so for a second it drew the girl's eye on her nipple.