Adjust app permissions
The first time you use an app, and sometimes when you install or update it, you are asked to grant the app 
permission to access certain data and phone features. You can adjust these permissions any time.
To adjust permissions by feature:
1. Go to Settings > Security & privacy > Privacy.
2. Touch Permission manager.
3. Touch a feature to see which apps have permission to use it.
4. Turn that permission on or off for each app as needed.
You can also adjust permissions by app.
Control access to your mic and camera
Block mic or camera from app in use
Any time an app uses your mic or camera, you’ll see the privacy indicator in the status bar.
When you see the privacy indicator:
1.
Swipe the status bar down and touch   or   to see which app is using it.
2. To block that app from using it:
a.
Touch   and touch Manage permissions.
b. Touch Microphone > Don't allow or Camera > Don't allow.
Block/unblock for all apps
To quickly block and unblock access to your mic or camera for all apps:
1.
Open quick settings and touch   Mic access or   Camera access.
2. Change it to Blocked.
None of the apps on your phone can use it.
3.
When you're ready to use the microphone or camera again, change   Mic access or   Camera 
access in quick settings to Available.
Settings : Security & privacy : Privacy
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