The short answer is, It depends.
If you already have a wallet that is backed up, then you have nothing to worry about. Your digital assets are safe and secure in your Kryptonio wallet. Even if your camera is broken, you can continue to use your Kryptonio wallet to transact, but eventually you will need to get your camera repaired or get a new device with a working camera. Without a working camera on your device, you will not be able to restore your wallet.
If your wallet is not backed up, you will need a camera that works to take a selfie and backup your wallet. Otherwise you will be at risk of losing your assets, if you lost your device or deleted the Kryptonio app.
Backup and restore your Kryptonio wallet, you will need to have a working camera on your device.