System Information

OpenCV version: 4.11.0
Operating System / Platform: Fedora 30 / x86_64
Compiler & compiler version: GCC 12
CUDA Toolkit version: 12.9.0

Detailed description

When building OpenCV with CUDA 12.9, the build fails due to the removal of nppGetStreamContext() from the public headers by NVIDIA. This API is still used in modules/core/include/opencv2/core/private.cuda.hpp.

Error log excerpt:

✅ Proposed Fix (already submitted in PR)
https://github.com/opencv/opencv/pull/27288
In the affected file private.cuda.hpp, add a version guard and manually construct NppStreamContext for CUDA 12.9+

Steps to reproduce

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)