Is there a mobile app that can control one mobile from another mobile?
Yes. There are many websites, apps that can be managed by one mobile to another mobile. However, I will say the name of an app with which you can hack the camera of another mobile. However, both the internet of the phone and the internet of your phone must be on.
The name of the app is Track View. You can download it from Google Play Store.
It also lets you know if he is using Emu, Messenger or any other service.
All you have to do is use this app.
1) Both of them must have internet connection in their mobile.
2) You need to install the app on your mobile.
3) After installing, you have to activate it with Gmail.
4) must use a password.
Remember, you can disable all the data in this app by going to the phone settings of the person whose camera you want to control. (E.g. notification, audio or video record etc.