To make your vector artwork into a playable movie file, it will have to be rendered, and another term for rendering is rasterizing. For example, in printing, a single image is rasterized when a vector image of a page is converted to the tiny dots the printer produces on the page.
Digital movies exist in pixel-based raster formats, so each frame of the vector animation must be converted into a pixel-based representation of that frame, for each frame in the movie. Most software today uses the word render. Rendering will also apply some form of video compression to the resulting movie file, you'll want to experiment with different codecs to see what kind of render quality they offer.
You are trying to identify a 'workflow', a path you can take to make your project, that uses open source software. The programs that have been brought up are very good, and could be the tools for the whole workflow, for many projects. You may also need some kind of video editing software. I'm not sure if there's a good open source video editor, or if Blender allows you to edit.
You should proceed by figuring out your production workflow, and looking for tools that can fulfill that workflow.
I would like to suggest Celtx as an excellent open source script writing tool.