Green Screen Animation Overlay

I need help overlaying animated cartoon backgrounds onto my green screen animation. The goal is to integrate the two seamlessly, with zero chroma key leakage.

Requirements:
- Use of video footage as background
- Cartoon/animated style for the background
- No leakage or artifacts around the edges

Ideal Skills and Experience:
- Proficiency in green screen compositing
- Experience with animated/cartoon video backgrounds
- Attention to detail and high-quality output

Please only bid if you have relevant experience.