At school for our news, we have a pro board (dont know what its called) and it has all the chroma settings, and multicam settings for broadcast, and we have done that effect on several occasions. What you could do is use a green/blue screen, and take the first part of it with the person on the right, then shoot the second part with the person on the left, and chroma it together.

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Mac G5 workstation with 4 gigs of ram, 4x250 gig drives in raid 5. High availability cluster server running centos for a server. 2xCanon GL2 cameras.

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