To start, drag and drop the first image from an image sequence into the main window.
Note that I have taped a meter stick on the vertical surface near my hand at the right. You need
something in the video you can use to calibrate the measurement. I could have used the spacing of the
wall boards, the height of the window, or anything else of known size. The calibration reference points
should be at about the same distance from the camera as the action of interest.