This app needs Camera access to function. Like any other Augmented Reality (AR) app.
You can allow Camera access from the permission screen that pops up during first opening of the app after installation.
Or alternatively, you can provide Camera access to this app from Phone settings.
This app gives multiple bird choices which can be generated in AR.
The birds make natural sound.
If you generate the AR bird closer then you can touch it in screen and make it fly!
If you generate the AR bird little far then you can move closer to the bird to make it fly.