Fix cudacodec so that it can use streams other than the default
* Add stream property to CUVIDPROCPARAMS so that the post processing and mapping (cuvidMapVideoFrame) of a video frame to cuda from the hardware decoder can use streams other than the default.
* Use standard OpenCV StreamAccessor::getStream() method for returning the raw cuda stream.
Add python bindings to cudaobjdetect, cudawarping and cudaarithm
* Overload cudawarping functions to generate correct python bindings.
Add python wrapper to convolution funciton.
* Added shift and hog.
* Moved cuda python tests to this repo and added python bindings to SURF.
* Fix SURF documentation and allow meanshiftsegmention to create GpuMat internaly if not passed for python bindings consistency.
* Add correct cuda SURF test case.
* Fix python mog and mog2 python bindings, add tests and correct cudawarping documentation.
* Updated KeyPoints in cuda::ORB::Convert python wrapper to be an output argument.
* Add changes suggested by alalek
* Added changes suggested by asmorkalov
Fix cudacodec::VideoReader::nextFrame python bindings
* Signla to python bindings generator that nextFrame's OutputArray is a GpuMat.
Also remove duplicate test in cudacodec
* cudacodec: drop CV_GPU, wrap GpuMat only
* Make it explicit that frame in nextFrame is GpuMat and cannot be multiple types as implied by OutputArray
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
