This plate shows the actress focused intently on the CG character (she doesn’t look very pleased). A matchmove was necessary to ensure the CG character stood correctly in the scene with the eyes located at the point of focus i.e. the white ball on a stick. The green screen spill was not too bad except on the side of here face.
I incorporated the bunny character from the Big Buck Bunny open movie and animated it to fit the scene.
Check out the results....

The source video sequence for this shot is from Hollywood Camera Work.
Bunny character (c)Blender Foundation from www.bigbuckbunny.org.