Window Screen capturing feature for QtMultimedia

What is the benefit? Why is this valuable?
Screen capturing of individual windows has been requested on top of video playback and recording which already works.

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What are common use cases?
Screen sharing of windows
Taking pictures of individual windows

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Technical information

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This issue explores the feasibility and requirements for adding screen/window capturing to QtMultimedia. On the input side, a user should be able to select a desktop screen or a window and the frame rate for capturing. Thus, on each platform we need to:

• get a list of opened windows and desktops
• read a window/desktop content

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The capturing object should work with QMediaCatpureSession, so we can display the capture content in a window or record it to a file. 

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