Free Download Safe Dot 2 Pro MOD Version Unlocked AdFree APK for Android Phones and Tablets, it gives you an indication on third party use.
Overview of Safe Dot 2 APK for Android
it gives you an indication when a system app or a third party app uses your device camera or microphone.
Similar to iOS14 feature it shows green dot when camera is being used and orange dot on microphone use. This app doesn't collect any kind of information.