When building with msvc, the build folder will look like this.

your_build_directory/
        ├───bin/
            ├───Debug/
            │   │   └───demo_all.exe
            │   │   └───...
            ├───Release/
            │   │   └───demo_all.exe
            │   │   └───...
            ├───demos_assets/
            │   ├───fonts/
            │   │   └───...
            │   └───images//
            └───opencv_world460.dll
            └───opencv_world460d.dll

The executables inside Debug/ and Release/ depend on the presence of opencv_world460*.dll, opencv_world460d.dll, and demos_assets/

If you want to run then from the Release/ or Debug/ folder, you will need to manually copy those files.