Run ./vcpkg install opencv in the vcpkg root folder (or just vcpkg install with "opencv" in the vcpkg.json file if you are in manifest mode) After it says it successfully installed, navigate to the ...

@lucaspbordignon this is because cuda8 provides nvcuvid.h and cuda9 provides dynlink_nvcuvid.h so opencv builds for cuda8 are not compatible with cuda9 I am still working on the solution for this.