Problems selecting the window capture area

Good afternoon.

I am experiencing a problem with changing the size of the selected window capture area.
The feature, works normally and in a good way if the window is integral.
However, when resizing and selecting which part of the window I want to be selected, the image that is provided to me is of a large zoom.

Anyone who has already gone through this issue, can help me.
I didn’t find any documentation on this issue.

I explain., In view of the ZOOM meeting window, I want to select only the area of ​​one of the participants.
but I can’t get results as I understood it should be.

It seems to me that when decreasing the area, Mimolive will zoom in the image, but in a part of the window that is not selected.
Experimentei em Janelas do ZOOM Meeting e Wzap por exemplo