I have a PNG picture and a short (about 5 seconds long) video. The video is an animation of a humanoid figure with red glowing eyes, but without pupils. I basically want to use the PNG picture as the humanoid figure’s pupils, that is, the PNG should always be positioned in the middle of each eye in the video that I want to create. Also, the PNG should be scaled with respect to the size of the eyes in the video at each point in time.
I don’t care about rotation, i.e., the pupils do not need to be correctly displayed with respect to 3D perspective.
I guess there’s a filter that I should use for overlaying the picture over the video, and maybe another filter to change the picture’s size? Do such filters exist?
EDIT: also, my picture is a square, I’d like to crop it into a circle when displaying it on the video, I’m sure there’s a way to do that in Shotcut.