pympress: fix gstreamer support

[leon-erd]

Description of changes

In the current version of this package playback support with gstreamer is broken because dependencies are missing.
I stumbled across this when I tried to embed a video in my presentation and running pympress on wayland. As it turns out VLC does not support embedded videos on wayland and opens the video in a new window (see Cimbali/pympress#320). When turning off vlc in the pympress config file videos cannot be played at all because gstreamer does not work.
This PR adds the missing dependencies.
The minimal additional dependencies I need to be able to play an embedded .mp4 video with gstreamer are:

gst_all_1.gst-plugins-base
gst_all_1.gst-plugins-bad
gst_all_1.gst-plugins-good.override {gtkSupport = true;}

but I think adding full gstreamer support (video/audio hardware acceleration, additional codecs) can't be a bad idea. Let me know what you think!

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

---

@tbenst @jtojnar @drupol

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[SuperSandro2000]

Suggested change

	gst_all_1.gstreamer
	gst_all_1.gst-plugins-base
	gst_all_1.gst-plugins-bad
	gst_all_1.gst-plugins-ugly
	(gst_all_1.gst-plugins-good.override {gtkSupport = true;})
	gst_all_1.gst-libav
	gst_all_1.gst-vaapi
	gst_all_1.gstreamer
	gst_all_1.gst-plugins-base
	gst_all_1.gst-plugins-bad
	(gst_all_1.gst-plugins-good.override {gtkSupport = true;})

That's what I take from the upstream docs https://github.com/Cimbali/pympress/blob/fc5ebfc79b5255ea801e4935aaa33f7bcadc595d/README.md#media-and-autoplay

I am not sure if the others are even used or loaded on demand.

[leon-erd]

I think the video playback is completely handled by gstreamer so I would assume the instance of gstreamer is independent from the rest of the package and can access all available plugins/extensions.
In the upstream docs it says: "and plugins gstreamer-good/-bad/-ugly based on which codecs you need" so why remove gst_all_1.gst-plugins-ugly?
I have taken the example from the wiki https://nixos.wiki/wiki/GStreamer for full gstreamer support.

[drupol]

Merged it, no answer from Sandro.