Aperture to automatically import videos
Aperture 3.2.2 imports video and stills by default for me from my iPhone with iOS 5.0.1. Are you perhaps using older software or different hardware?

The only time I've seen Aperture not show items for import is when you take more photos / videos after the import window is open and the new captures will not show until you disconnect and reconnect the USB 30 pin connector.