I am looking for a way to "augment" or overlay 3D object in a still image or a pre-recorded video source. I have used Vuforia and ARCore before but I was unable to determine whether these would allow using a pre-recorded video source or maybe even just a still image to be overlaid with 3D objects of my choice. I am hoping to use Unity for developing said solution and deploy to an Android device.
Would you be able to tell if there is something out there that can achieve this result? I would be hoping that if the user takes an image with a marker visible, the user could later revisit the image and overlay an object on top of that still image where the marker is.