Hi everyone, I'm EndeavourOS(Arch) user.
Did anyone also had such problem that the Kdenlive or any other software needed CUDA package to use GPU acceleration? It’s very strange for me, because basically any game, and for example Blender, are fine with just having a normal drivers.
I thought that the CUDA Package(https://archlinux.org/packages/community/x86_64/cuda/), like on Windows is needed only for the software development that needs CUDA Toolkit.

* After installation of the CUDA Kdenlive is now able to use experimental GPU-accelerated presets, but I find it quite oddly that you need a 4gb package for this feature, where other software don’t need it.

* Yes, Blender somehow is able to render with GPU without CUDA
I tried it, I installed it as a .tar package from the Blender.org, so I have no idea why Blender from the Arch repository requires CUDA for it to work.

* Arch's CUDA package is including both CUDA Runtime and CUDA Toolkit.

My experience is completely different from yours: I have never had to install CUDA, the GPU-programming kit from Nvidia, in order to use GPU rendering. I am using the proprietary Nvidia drivers for my GeForce GTX 1650. Actually Kdenlive will use between 17 % and 20 % of video ressources from the GPU when rendering.