OpenCV fix 14774 breaks cudacodec

* Example to describe comilation issue

* Added required changes, builds with -DWITH_FFMPEG=ON|OFF

* Working with standard ffmpeg cap.

* Changed cudacodec to use new retrieveRaw() function, to retrieve the raw encoded bitstream, from the videoio module  instead of its own implementation.

* Fix cv::cudacodec::VideoWriter

* Update to use VideoContainer

* Remove header used in testing

* Remove warning

* remove dependence on redundant ffmpeg codecs

* cudacodec: use .set(CAP_PROP_FORMAT, -1) to extract RAW streams

* whitespace

* addressed alalek's comment