Dynamic Background Replacement Specialists

I have a series of moving-camera shots featuring people and props that need complete background replacement. The foreground action must stay untouched while every trace of the original setting disappears, so clean masking, precise rotoscoping, and rock-solid motion tracking are critical... (Budget: $30 - $250 USD, Jobs: 3D Animation, 3D Modelling, 3D Rendering, After Effects, Rotoscoping, Video Post-editing, Video Production, Visual Effects)