You can write platform-specific code (https://flutter.io/platform-channels/) to create a plugin, os specific needs for your apps.

For example if you want to use the Camera, you can you this plugin : https://pub.dartlang.org/packages/camera

For the map, the team is working hard on it (https://github.com/flutter/flutter/issues/73) but you can write specific code to embed a google maps view into Flutter.

There are a lot of aspects I didn’t mention, because others already wrote about it, feel free to read their posts.