nothing went wrong.
pycharm is an IDE for Python. it does not “use” CUDA. packages you installed to your python may be able to use CUDA.
“support” means someone wrote a lot of CUDA code that duplicates non-CUDA functionality. you need to understand what you want CUDA-accelerated. it’s not a “just do everything with CUDA” thing that magically makes everything better. you should read a lot of introductions and guides for this kind of thing.
since you’re a beginner, don’t even go near any CUDA at all. you should first learn more about how computers work, what Python is, what pycharm is, and how to program in general.
if you do want the CUDA modules in opencv, there are ways.
the official opencv-python package does not support CUDA. it does support OpenCL.
I don’t know if opencv-python-contrib contains the CUDA modules that are among the contrib modules.
cudawarped maintains builds of OpenCV with CUDA specifically included. use one of the versioned releases here: