Hello,

This is the second patch of the group which adds the option to use CUDA
context current to calling thread. It simplifies the usage of ffmpeg
libraries in applications which rely on CUDA runtime API.

Example:

AVDictionary *opts = NULL;

AVBufferRef *hwDeviceCtx;


av_dict_set(&opts, "current_ctx", "1", 0);

av_hwdevice_ctx_create(&hwDeviceCtx, type, NULL, opts, 0);