Nvenc-nvEncodeAPI.h

Hey !

I am trying to use GPU to do some application
I am currently trying to use ffmpeg with Nvenc (i dont know if they are an other way to use gpu with ffmpeg ?)
but when i try to compile ffmpeg with nven (this is an option)
./configure --enable-nonfree --enable-nvenc
i get ERROR: nvEncodeAPI.h not found
this file is in the NVENC SDK and i downloaded it so i dont understand, maybe i need to move this file ?