Google has launched a free dash cam application for Android Auto that utilizes existing in-built vehicle cameras to capture journeys without additional hardware. Car manufacturers must customize the app for their specific vehicle models. Key features include using external storage for video recordings, automatic activation based on triggers like speed limits, and customization options for notifications and file storage durations. The app will only work in vehicles with cameras and will not replace traditional dash cams. Its availability will depend on updates from vehicle manufacturers.