There is a user-friendly mature software for this already (which technically did not even use ML in the recent sense because it is much older): SVP project. You can connect it to many players and play any video of your choice in realtime. Then there are high quality tools in video editing software like Premiere or Davinci Resolve which do this also (pixel flow framerate adjustment)... Then there is hardware accelerated version of this in NVIDIA graphics cards which can be used in some video players too...

This is mostly a solved problem, it has existed for many years, no real need for ML here. (Possibly for some quality improvements?)