For the usage of OpenCV, just concern about these three folders: lib, src and test_sets. If you want to use this code in Visual Studio or something others, please config your OpenCV environment and add theses files to your project.
对于能看懂中文的朋友， 可以去简书看看更详细的的描述。 https://www.jianshu.com/p/96df7c6fb24e