Get Camera icon back on Home Screen

Drag it from the App Library to your Home Screen: ⇣

Alternatively, you can ask Siri to "Open App Store".

If the App is missing completely, then you can simply download ▷ Camera. ◁ 📷

Good luck! 👋🏼😉

swipe home screens left til you get to App Library.

Find the icon, tap and hold it til it jiggles.

Move it slightly downwards then with the other hand swipe the home screens back to where you want it.