Which camera is it? (there seems to be more than one for Raspi)

Make sure you have the v4l2 drivers for it, otherwise it won't be recognized.

Start building custom plugin GUIs using DearImGui:

In what way is this library "designed specifically for Windows 64-bit systems" ?

Also I recommend against committing zip files (and other release binaries) into your repository as it will blow up the repository size when you do updates.
Does Codeberg not support release artifacts?

I don't really understand why you put this on patchstorage.com .. since you are not sharing any patches here.
The zip file contains some screenshots. Seems to me that there are better ways to share those ..

Start by reading the manual? -> https://github.com/pure-data/deken/tree/main/developer

This is absolutely insane

You don't need the [+ 1] if you do [sel 0 1 2].

Also this [$1 20( is completely unnecessary.

Sidenote is that number-boxes turn into [f ] objects in the Heavy compiler which are like a number storage (that you can store and retrieve values from). If you have a lot of them they will add to the total program memory of your project.