Opencv 3.1 display window without default button

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Hello everyone,

currently i have a problem, please help me.

with this code

  VideoCapture cap(0);
        if(!cap.isOpened()) // check if we succeeded
            return -1;

          Mat edges;
         namedWindow("edges",3);
          cv::resizeWindow("edges",820,820);

          for(;;)
          {
            Mat frame;
            cap >> frame;
            imshow("webcam", frame);
            if(waitKey(30) >= 0) break;
           }

but i want to display camera without button and coords for user, how i can to do this?