Installing OpenCV on Windows for C++

Go to https://github.com/opencv/opencv and download the latest release. Extract files to local drive (eg : C)

Add bin folder to the Environment Variables path. For eg: C:\opencv\build\x64\vc15\bin

Create a New Visual Studio project C++ console.

Set the platform target to x64

Add Directories by going to: Project->Properties->Configuration Properties-

VC++ Directories
1. Add Build Directories: C:\opencv\build\include
2. Add Library Directories: C:\opencv\build\x64\vc15\lib

Linker Input
1. Add to Linker->Input: opencv_world452d.lib (452 depends
on your OpenCV version)
d for debug, without d for release

Click on your Project name on right side in Solutions Explorer, and right-click on it to Add a New Item.

Select C++ File and rename it as test.cpp.

Finally, you can run this demo code in your visual studio IDE to see if it’s all working fine.

#include <opencv2/imgcodecs.hpp>
    #include <opencv2/highgui.hpp>
    #include <opencv2/imgproc.hpp>
    #include <iostream>

    using namespace std;
    using namespace cv;

    void main() {

        VideoCapture cap(0);
        Mat img;

        while (true) {

            cap.read(img);
            imshow("Image", img);
            waitKey(1);
        } 
    }