I found this list of the available ios app URl schemes: https://ios.gadgethacks.com/news/always-updated-list-ios-app-url-scheme-names-0184033/
The camera app is not in this list. Trying camera:// does give a prompt to open the Camera app, however on accepting us errors with "address is invalid".
What is the correct way to open the Camera App on iOS via such an URL scheme?