So I had this issue and alot other ones. Try to open camera then when it closes or crash hit your multi app button and click on the icon of the camera and go into your info. Once there see if your permissions are enabled. And Change system setting is allowed. Also go click battery see if Allowed background activity if you want it eating battery it's fine to leave it marked. Otherwise it will only run when you want it. Then go back choose data too yeah it's annoying but restrict data will also make sure it doesnt run in background or use data for useless checksing
If this isnt working it's possible your apps permissions all got changed. Also happened to me you will need to go to apps setting and go change each app individually and allow permissions yup more time consumed.