GES, picture in picture, take only sub-rectangle of foreground video

[David Ing]

I am using GES to create a "picture in picture" type of video.  I have a
large video in the background and a small video in the foreground corner.
This is working perfectly.

Now, for the video in the foreground, I don't want the entire surface area
of the video to be displayed.  I only want it to display a sub-rectangle of
that foreground video.

By the way, I have already determined that the xpos, ypos, width, height
proprties of GESVideoSource will scale the video (and they represent the
position of the video on the destination canvas).  So they don't behave in
a way that would allow me to take the sub-rectangle.

My question is:  Is there an easy way to take the sub-rectangle of the
foreground video using GES?  How?
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