Bad cache (and or data) files may be the reason for this issue and clearing them should enable you to run the camera app. To be on the safe side, before clearing the cache and data, make a backup of your photos and videos.
To clear the cache and data, follow the steps below:
Taken on a Samsung Galaxy device running on Android OS 8 - steps may vary from one device to another.
If your device's battery is removable, remove it while the mobile device is turned on and reinsert it after a couple of minutes.
If you don’t receive the email in the next 2 minutes please check your junk folder, and add [email protected] to your safe sender list.