the blue for daylight and the green for studio light, depended also of the background video and the colors of your figures, you have also the white screen option.. but first you have to put the original video in the scene, set the light colors correct and the shadows, if the shadows are not much visible on the video the alpha channel will help as well.. here you have to se your good eye for it.. I must say that LD idea is very nice too, I saw something like this in real production but also everything was only blue and the actors have a blue outfit on some body parts.. it will cost you more work but well with a nice final effect too.

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