All of the filters inside cudafilters have internal state making it unsafe to use the same filter in multiple CUDA streams. See this post on the forum for details.

This internal state might not always be used as it depends on the specific parameters passed to the create function but to avoid confusion I have added a general comment regarding stream usage to all the filters.

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake