Can applications be using mic/camera without permission? Normally when an application on iPhone or iPad needs to access the microphone or camera it should get permission from the user.  

Considering applications for iOS distributed through AppStore,
if such an application never asked for permission, and isn't listed in the privacy tab in Settings, is it guaranteed that the application can't access the microphone or camera?
Unless it's a hacked system, then no, it will not have access since access is only possible via API's that require granting access.