Recently I had to resize a rather large 4k H.265 video file to 1080p H.265 file. This is what I used. SO much faster than using the CPU for decoding!
ffmpeg.exe -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i <input file> -resize 1920x1080 -c:v hevc_nvenc -preset fast -rc vbr -acodec copy <output file>
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