Steps

Create a simple program

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#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, char** argv )
{
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }
    Mat image;
    image = imread( argv[1], IMREAD_COLOR );
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

Create a CMake file

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cmake_minimum_required(VERSION 3.16)
project( DisplayImage )
find_package( OpenCV REQUIRED )
if(OpenCV_FOUND) # use if it opencv is not set REQUIRED
    message(STATUS "OpenCV library: ${OpenCV_INSTALL_PATH}")
    message(STATUS "    version: ${OpenCV_VERSION}")
    message(STATUS "    libraries: ${OpenCV_LIBS}")
    message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
else()
    message(FATAL_ERROR "Error! OpenCV not found!")
endif()
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

Generate the executable

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mkdir build
cd build
cmake ..
make

Results

./DisplayImage lena.jpg and then show a window showing the image
lena.jpg

References