Chroma key

How is it possible to fit the chroma key screen or part of it in the bottom screen? In some other programs you could pick a regular or irregular shape off the green screened clip to fit it into the background clip. Thank you.

Started with this image.

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Is it possible to have only an irregular cut out from the subject in the green screen clip ? Thanks.


From this source image

From this source image

Use the Mask: Simple Shape filter multiple times, and on the extra ones you can set Operation to control hows the shapes combine together (add or subtract).