Question / Help Highlight recording area of screen?

Hi, sorry if this is in the wrong section.

Is there a way to highlight an area of the screen, for example, with a square. My desktop is 3440x1440 but I record a central area of 1280x960.

I made a wallpaper with a 1280x960 square on it and it's fine, but I'd like to be able to move the square so things aren't always so rigid.

I know there is no way to do this in OBS itself, but I'd like to know if others have needed this and maybe even solved it.

Any help appreciated.
Thanks
 
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