Installing VapourSynth Via nix Package Manager

[ZenMystic]

I am running Debian 12 64 bit. I installed VapourSynth via nix package manager. I have this:

python3-3.10.13
python3.11-vapoursynth-65
vapoursynth-65
vapoursynth-editor-R19-mod-4-with-plugins
vapoursynth-mvtools-23

I also run this test script:

import vapoursynth as vs
core = vs.core
print(f"VapourSynth Core Version: {core.version()}")
clip = core.std.BlankClip(width=1920, height=1080, length=100, format=vs.YUV420P8)
print(f"Blank clip info: {clip.width}x{clip.height}, {clip.format.name}")

I got this:

python test_vapoursynth.py
VapourSynth Core Version: VapourSynth Video Processing Library
Copyright (c) 2012-2023 Fredrik Mellbin
Core R65
API R4.0
API R3.6
Options: -

Blank clip info: 1920x1080, YUV420P8

But now what? I need another library because I can not seem to do much else.
I remember when using avisyth back in the day (2006) things like dv2 for turning back my DVDs to 23.976 and things like FFMS2 EEDI and the like.

But it have been so so long. I recently bought some DVDs Alien Nation TV show the discs are double sided which I hate as is so easy to get finger prints and the like on them. I would like to put the show on my NAS But I am at a loss.

Can any one help me out? Where and how do I get the libraries I need?
And how do I do the inverse dv2 pull down thing again?

Thanks