Is there a way to get the camera overlay an image onto the rendered image(s)/video? Or, if not, how would I do this in video post? The issue is, I need to be able to do it If i'm rendering a series of images, which I am complling into a GIF.
Video Post is a PITA, a very very bad interface. You could render from the Material Editor. Set up a Composite map with all the layers you want, right-click on the sample sphere, Render Map. If you want to overlay an image on top of the 3d scene, you could put a plane right in front of the camera and put a transparent…