>>11240
I think they use Remini, really great with the facials and restoring/retouching faces with AI. iOS/Droid app, but it requires an account and it works in the cloud, free options are limited, most of the good stuff is paid-only. That, sadly, rules out it's usage for videos.
I'm a dumb fuck so I don't know how to train my own neural network locally to mimic what Remini does, but it's technically possible, if you really know your shit and RTFM.