How to find edge pixel coordinates at corners of the bounding box [closed]

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I am using dnn module of opencv for object detection in tensorflow. I want to know how to find pixel coordinates (x,y) at corners of bounding box of detected object as highlighted in blue on image below.

I use below snippet for drawing bounding boxes, which is from opencv dnn samples

    cols = frame.shape[1]
    rows = frame.shape[0]

    for i in range(detections.shape[2]):
        confidence = detections[0, 0, i, 2]
        if confidence > args.thr:
            class_id = int(detections[0, 0, i, 1])

            xLeftBottom = int(detections[0, 0, i, 3] * cols)
            yLeftBottom = int(detections[0, 0, i, 4] * rows)
            xRightTop   = int(detections[0, 0, i, 5] * cols)
            yRightTop   = int(detections[0, 0, i, 6] * rows)

            cv.rectangle(frame, (xLeftBottom, yLeftBottom), (xRightTop, yRightTop),
                          (0, 255, 0))
            if class_id in classNames:
                label = classNames[class_id] + ": " + str(confidence)
                labelSize, baseLine = cv.getTextSize(label, cv.FONT_HERSHEY_SIMPLEX, 0.5, 1)

                yLeftBottom = max(yLeftBottom, labelSize[1])
                cv.rectangle(frame, (xLeftBottom, yLeftBottom - labelSize[1]),
                                     (xLeftBottom + labelSize[0], yLeftBottom + baseLine),
                                     (255, 255, 255), cv.FILLED)
                cv.putText(frame, label, (xLeftBottom, yLeftBottom),
                            cv.FONT_HERSHEY_SIMPLEX, 0.5, (0, 0, 0))

    cv.imshow("detections", frame)
    if cv.waitKey(1) >= 0:
        break