No tutorials for Hardware accelerated video codecs

[wqh17101]

System Information

OpenCV version: 4.7.0

Detailed description

Althrough the release note of 4.7.0 said that CUDA 12.0 support. Hardware accelerated video codecs support on NVIDIA platforms with modern Video Codec SDK (NVCUVID and NVENCODEAPI)., there is no document for how to build opencv which supports this feature and how to use it. There is no samples.

Steps to reproduce

Just use the opencv 4.7.0

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)

[cudawarped]

The release notes should probably specify that this is part of the cv::cudacodec namespace, that said see cv::cudacodec::VideoReader and cv::cudacodec::VideoWriter for build instructions and the destination of the respective samples.

[wqh17101]

@cudawarped you mean this is a part of opencv-contrib?

[cudawarped]

@wqh17101 as far as I am aware yes.