Do I need a video or image device connected to my product to be able to annotate?
There is no device connection needed to annotate. You can simply annotate on a projected no signal blank screen.
You can annotate using the projector's built-in interactive tools. Make sure you use the remote control to select a different source from the one specified for interactivity. There are built-in interactive backgrounds available for annotation with or without devices connected using the projector's internal Whiteboard mode.