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Is your capturing device actually capturing frames in the first place? Could you check it with:

VideoCapture cap(0); // open the default camera
if(!cap.isOpened())  // check if we succeeded
     cout<< "Something is wrong, I am not receiving anything!"<<endl;

A wild guess: Is your capturing device actually capturing frames in the first place? Could you check it with:

VideoCapture cap(0); // open the default camera
if(!cap.isOpened())  // check if we succeeded
     cout<< "Something is wrong, I am not receiving anything!"<<endl;

A wild guess: Is your capturing device actually capturing frames in the first place? Could you check it with:

VideoCapture cap(0); // open the default camera
if(!cap.isOpened())  // check if we succeeded
     cout<< "Something is wrong, I am not receiving anything!"<<endl;