Force VideoReader to decode all YUV video formats to NV12

[cudawarped]

Currently VideoReader only supports 8 bit YUV 422/420 video's. This fix allows all supported YUV inputs 10 bit 420, and 8 and 16 bit 444 to be decoded. The approach taken is to truncate all YUV formats to to NV12 instead of including CUDA kernels to convert from P016, YUV444 and YUV444_16Bit to BGR, which is probably overkill for OpenCV and can be included at a later date if desired.

The PR also allows the raw YUV frame to be output as well if desired.

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

[asmorkalov]

I get build error:

/mnt/projects/Projects/OpenCV/opencv_contrib/modules/cudacodec/src/video_reader.cpp: At global scope:
/mnt/projects/Projects/OpenCV/opencv_contrib/modules/cudacodec/src/video_reader.cpp:102:14: error: extra qualification ‘{anonymous}::VideoReaderImpl::’ on member ‘set’ [-fpermissive]
         void VideoReaderImpl::set(const ColorFormat _colorFormat) CV_OVERRIDE;

System: Ubuntu 18.04, Video Codec SDK 11.1, Cuda 10.2.

[cudawarped]

I get build error:

Apologies, I thought I had changed that. Now fixed on both PR's.

[asmorkalov]

👍 LGTM.
Tested on Ubuntu 18.04, CUDA 102, NVIDIA Video Codec SDK 11.1.