Yes, you only need one camera. You can do everything we’ve shown you with one Mevo and an iPhone. The Mevo app currently supports one Mevo camera at a time.
If you would like the ability to switch between multiple Mevo cameras, you can integrate Mevo as a remote camera source in the Livestream Studio production switcher. This allows you to wirelessly connect your Mevo to Livestream Studio, and thus gives you the ability to switch between multiple cameras.
You can learn more about Livestream Studio here.