Add scaling and cropping options to cudacodec::VideoReader

[cudawarped]

Nivida's Video Codec SDK allows the user to specify the following parameters to control the final output:

• Scaling dimension
• Cropping dimension
• Dimension if the user wants to change the aspect ratio

this pull request adds this capability to cudacodec::VideoReader.

From local experiments this does not effect the decoding utilization, however choosing for example a smaller ROI from the decoded video stream reduces the CUDA overhead from the post processing routines (ConvertNV12BLtoNV12).

Additionaly this addition makes the checks described in #3001 unecessary.

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]

In file included from /mnt/projects/Projects/OpenCV/opencv_contrib/modules/cudacodec/test/test_main.cpp:43:0:
/mnt/projects/Projects/OpenCV/opencv_contrib/modules/cudacodec/test/test_precomp.hpp:50:10: fatal error: opencv2/cudawarping.hpp: Нет такого файла или каталога
 #include "opencv2/cudawarping.hpp"
          ^~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
modules/cudacodec/CMakeFiles/opencv_test_cudacodec.dir/build.make:75: recipe for target 'modules/cudacodec/CMakeFiles/opencv_test_cudacodec.dir/test/test_main.cpp.o' failed
make[2]: *** [modules/cudacodec/CMakeFiles/opencv_test_cudacodec.dir/test/test_main.cpp.o] Error 1
CMakeFiles/Makefile2:6646: recipe for target 'modules/cudacodec/CMakeFiles/opencv_test_cudacodec.dir/all' failed

[cudawarped]

Sorry I missed that, that will teach me to be lazy and just build on Windows!

[asmorkalov]

The issue is still there.

[cudawarped]

I've added the other missing target but I am at a loss as to why it builds without it, I tried both make and ninja on WSL Ubuntu 20.04 and it built without the cudawapring target. Maybe I'm missing something.

[asmorkalov]

👍