video_gpuaccel_demo.py didn't run. Please tell me how to solve

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Hi there.
I tried to run video_gpuaccel_demo.py. But an error occurred.
An error is
RuntimeError: The ffmpeg is not compiled with NVENC support.

Please re-compile ffmpeg following the instructions at:
https://docs.nvidia.com/video-technologies/video-codec-sdk/ffmpeg-with-nvidia-gpu/

This URL is not found.
Someone please tell me about how to re-compile ffmpeg