@3run: A full motion blur where every pixel is smoothed over time is possible. What do you mean by "which will blend from camera movement instead of mouse input"? Excluding models would require, that I know at each pixel, that there is something that I shouldn't blur. If you were able to provide that mask, a masked motion blur would be possible, too.

@Ch40zzC0d3r: You mean the blurring of the weapon or the zoom effect in its lens? The zooming would require a re-rendering of the scene of course. The explicit and static blur of things can be done, but as with 3run's suggestion, I would need a mask for that. A shader that draws the content of a target with a mask onto the screen is possible - you would need that too, for your weapon on that screenshot (or you render it onto the model but that would have been done by you).