Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Graphics and Visual Effects › Green Screen Problems › It sounds like you need to
It sounds like you need to combine the chroma key with 'masks', maybe even some 'rotoscoping'?
Masks basically allow you to chop up the frame and define which bits of it you want the effect to work on. Although this can obviously be more difficult when the problem area is also moving around a lot… This is where the rotoscoping comes into it.
But give the masking options in Final Cut a go first… As Brian says, green screen is never easy. Ideally you wouldn't have any green in the footage your shooting in the first place, but that's not very helpful to point out at this stage!