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There are a couple of projects that use optical flow:

https://nageru.sesse.net/ https://github.com/slowmoVideo/slowmoVideo/

iPhone cameras actually record at 120/240fps rather than recording at a lower rate and interpolating.

Thank god. I don’t want the soap opera effect on my videos. Interpolation is the first thing I disable on a TV.

On TVs where it's interpolating to convert from 24fps to 60 it usually looks terrible, but slowing down a real 60fps video using motion interpolation usually looks much better, as there's less that needs guessing

Until everybody starts filming at 60/120hz, I am forced to use motion interpolation on my tv, even if it's full or artifacts. I hope it will take less than 50 years for movie technology to advance..

There's https://www.svp-team.com/wiki/Main_Page which is based on http://avisynth.nl/index.php/MVTools