At times, it might be useful to have the capability to overlay text, images, and objects over an existing Flash video or animation created in Presenter. However, Presenter does not allow anything to be overlaid onto videos, always keeping the video on the top of the stack of objects on a slide.
This doesn't mean that it can't be done though. Quizmaker allows placement of objects over videos which can then be published as new videos and brought into Presenter.
Another way that this can be done is to take a video from an existing presentation and overlay new information and graphics onto it. When the presentation is published, each slide becomes its own Flash video. These can then be imported into future presentations or into Quizmaker, where they can have text, images, and shapes overlaid on them.