How to get Image using opencv as input for C++ program

i made a code for solving soduko and now i want to convert sudoku of real life to digital grid using opencv. But i can't import libraries in vscode 2019. Plz help. i get include error

i can't find anywhere how to get it to work. I dont want to work in visual basic but just c++ file

#include <opencv2/core.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/highgui.hpp>

so i get import errors on these and i can't find where to import it. I added to Path the opencv bin folder