Basic Video Editing - Ongoing Work

We have ongoing work for someone to do very basic video editing. We're talking iMovie stuff, not Premiere. The videos are basically slideshows of either 15 or 20 still images (about 1 -2min long) that have very basic animation (Ken Burns effect), transitions and some text overlays. We have existing video projects (created in iMovie) that would be used as templates (unless you have a better program), so all that would be required is swapping out the existing images with some new ones (supplied) and typing in some new text (supplied). This is just getting underway at the present but is expected to progress to 100's of videos per week. The successful applicant would be required to complete a non-disclosure/non-compete contract. The work needs to be quoted on a "per video" basis.