Painstakingly cut out in Superimpose and export as a mask (choose a plain white or coloured background when cutting out).
Take original into iColorama and blur using Effects>Blur>2 reducing opacity then apply.
Choose Effects>Blend and bring in cut out. I kept some of the pavement they were standing on so to create a smoother transition of the pavement I choose the brush mask and masked out some of the cut out background.
I then took it into Stackables and grunged it up a bit but didn't want to lose the details.
App: Hipstamatic, Superimpose, iColorama, Stackables