I believe that Peter Jackson's recent endeavour in cleaning up WW1 footage employs significant ML for de-noising, frame interpolation, and colorising. I haven't seen the final film, but some of the clips are staggeringly good: https://www.bbc.com/news/av/entertainment-arts-45884501/pete...
Edit: Here's maybe a better link -- https://www.bbc.com/news/av/entertainment-arts-45803977/pete...