d3d11desktopdupsrc: Expose dirty-rect area via ROI video meta
The dirty-rect concept in dxgiscreencapsrc (Desktop Duplication API) can be shared with d3d11videosink (both are based on DXGI!!). Note that d3d11videosink is utilizing the direty-rect concept in a very limited way while swapchaining. But if the capture side dirty-rect information can be forwarded to d3d11videosink, we might be able to save more GPU resource while swapchaining.