How to solve "no rule to make target 'install'" while installing ffnvcodec (Windows)

Question

I tried to install ffnvcodec for ffmpeg on windows and when I try to install it I get:

make: *** No rule to make target 'install'. Stop.". The command is: "make install PREFIX=/usr

and:

1. Since I'm still learning, I get that PREFIX=/usr is the directory where I want my program to be installed (correct me if I'm wrong), but I don't know how to specify the location (if you could give me an example it'd be great).

2. On Nvidia site it says to copy all headers files in a specific directory, which I did, but it gives me this error. I'm new to this, so I don't know what to do and I can't find any solution to this problem.