My first response was wrong.
NVENC will work for Windows XP as well.
On Windows, there are three initialization options:
On Windows Vista and Windows XP, NVIDIA NVENC SIP blocks are not exposed to the system by the driver, so no.
For libnvenc and similar...
If anyone here has a Windows build environment, they can try to build the package and see if it works.
Separate names with a comma.