The absolute easiest way would be to drop your image into Photoshop and play around with the image there. I suggest a render without the background, saved in PNG format (which will give you an Alpha channel which you can use to slot in the background after), and a render with the background only. After you finish getting crazy with the blur, slot the two together, and Robert is your mother's live in lover. :)

Coppula eam se non posit acceptera jocularum.

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