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WIP: nvcodec: Add new CUDA video filter elements

tests: Add cuda filter tests

Testing video colorspace conversion
nvcodec: Add CUDA video scale element

Add new element for video resizing using CUDA
nvcodec: Add CUDA video convert element

Add new element for colorspace conversion using CUDA.
nvcodec: Add generic CUDA video convert object

Introducing generic video convert object similar to video-converter
but using CUDA.
nvcodec: Add support runtime CUDA kernel source compilation

Add util functions for runtime CUDA kernel source compilation
using NVRTC library. Like other nvcodec dependent libraries,
NVRTC library will be loaded via g_module_open.

Note that the NVRTC library naming is not g_module_open friendly
on Windows.
(i.e., nvrtc64_{CUDA major version}{CUDA minor version}.dll).
So users can specify the dll name using GST_NVCODEC_NVRTC_LIBNAME
environment.
nvcodec: Add CUDA upload/download elements with base class for CUDA filters

Similar to glupload/gldownload elements but for CUDA memory.
It will help transfer memory between system and nvidia GPU
Edited by Olivier Crête

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