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Hi or,

You can find tutorials on how to install OpenCV on Windows and get it running with visual studio here.

About the code to start the webcam and show the video it is really simple :

#include <opencv2/opencv.hpp>
#include <iostream>
int main (int, char**)
  //Open the first webcam plugged in the computer
  cv::VideoCapture camera(0); 
    std::cerr << "ERROR: Could not open camera" << std::endl;
    return 1;

  //Create a window to display the images from the webcam
  cv::namedWindow("Webcam", CV_WINDOW_AUTOSIZE);

  //Pick up a new frame and display it until you press a key
    //This will contain the image from the webcam
    cv::Mat frame;

    //Capture the next frame from the webcam
    camera >> frame;

    //Show the image on the window
    cv::imshow("Webcam", frame);

    //Wait for a key to be pressed
    if (cv::waitKey(30) >= 0) break;

  //Success. The program accomplished its mission and now it can go
  // to the heaven of programs.
  return 0;

Welcome to the world of OpenCV