Is it possible to add Flash animation to a video created using Vegas. If so, how would I go about doing this? Also, could Flash be used to make a DVD menu?
Flash can be used to make DVD menus in Adobe Encore CS3, but not in DVD Architect. You could import an SWF file from Flash or other Flash authoring tool to Vegas, render that as an MPEG for use in DVD Architect.
Vegas will import swf files so long as they're Flash 4 compliant (no sprites, etc.) Many people use Flash tools as a titling tool.