This will be somewhat difficult, since it's almost guaranteed that positioning of said element is based off of the positioning of the rest of the page. If the red part is part of an iframe you could easily just load up that URL.
I think the better question would be; Why do you need it to show only the outlined part? You could try working with a zooming in, or injecting CSS to make the outlined part take up the whole screen. Other than that I can't think of any way to easily accomplish what you need.