understanding return value of some function in Python OpenCV
<p>I'm having some difficulties understanding return value on some function on Python OpenCV2. For example, I know that <code>BoundingRect</code> returns x,y coordinates, width and height, but what I don't know what order and another possible output in <code>BoundingRect</code>.</p>

<p>In the OpenCV2 manual, <code>BoundingRect</code> and other function such as <code>contourArea</code>, <code>getTrackbarPos</code>only outputting <code>retval</code> which is confusing for me. Can I know the exact order, what data and any other output that might exist? </p>