Video editing - variable cropping?

Can the crop feature be varied along the video timeline so to speak? The issue is the video capture I have involves several different windows that open in various positions on the desktop and in varying sizes. I was hoping to edit the frames by moving/resizing the crop window at variable points along the length of the video. I suppose I could limit the field when recording by moving the various pop up windows that open as best as possible into a 'fixed' recording window frame but that's not ideal.

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