For restoring old Anime - take a look at:
waifu2x
Anime4k
Topaz Video Enhance AI
Some problems (like tha shaking) hyve to be adressed before running the above tools, but cleaining out some edges, getting rid of some of the noise, etc.. can be adressed by these "AI" apporaches rather good.
Video2x is a GUI for the first two, hybrid has filters in it - so you might consider to look at these to get some inspiration for you own scripts.
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