From Wiki
Visual effects editor – The visual effects editor incorporates visual effects into the current cuts of live action sequences, producing multiple versions of each shot. Altered scenes are then evaluated by the visual effects supervisor and creative director for aesthetic and technical direction, and by the producers for review and final editing.
Rotoscope artist/ paint artist Rotoscope & painters artists may rotoscope the footage, manually creating mattes for use in compositing. They may also paint visual information into or out of a scene, such removing wires and rigs, logos, dust busting, scratch removal, etc
Probably Rotoscope artist would be most appropriate, but Visual effects editor sounds a little more cool.
Johnny Cuevas, Editor
ThinkCK
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.