OpenCV - read camera and process image

#include<opencv2/opencv.hpp>   

using namespace cv;

//----------------------------------- [main() function]--------------------------------------------  
// Description: The entry function of the console application, our program starts here  
//------------------------------ -------------------------------------------------- -----------------  
void main()
{
//[1] Read the video from the camera  
VideoCapture capture(0);//Open the camera  
if (!capture.isOpened() )//If the camera is not turned on, return.
return;
Mat edges; //Define a Mat variable to store the image of each frame
//[2] Loop to display each frame  
while (1)
{
Mat frame; //Define a Mat variable to store each frame frame's image  
capture >> frame; //read the current frame                          
if (frame.empty())
{
break;
} else { cvtColor(frame, edges, CV_BGR2GRAY);//Convert color to grayscale   blur(edges, edges, Size(7, 7));//Blur   Canny(edges, edges, 0, 30, 3 );//Marginalize   imshow("Video", frame); //Display the current frame   } waitKey(30); //Delay 30ms   } capture.release();//Release resources destroyAllWindows();//Close all window }