add support for nvenc and accel_assist #2320

Job	Run time
cppcheck	3m 49s
code formatting check	21s
min features with gcc	2m 15s
min features with g++	2m 27s
min features with clang	2m 46s
max features with gcc	3m 54s
max features with g++	2m 46s
max features with clang	4m 23s
max features with clang and AddressSanitized	3m 36s
max features with gcc and DEBUG	2m 57s
max features with gcc for 32-bit arch (legacy OS)	2m 6s
max features with g++ for 32-bit arch (legacy OS)	2m 1s
max features with clang for 32-bit arch (legacy OS)	2m 38s
	35m 59s

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