Viewing camera on the camera itself

So i came across something while using this app that i think would be pretty cool. Heres my scenario…

Ive got a few phones i use for cameras without service and cracked screens. They still work though. Then i have a big tablet Ipad air 2 i use. ALL THE. TIME. so i use this as my center to look at all these devices. But sometimes i want to use the ipad run alfred in the background on it all day and view it later but in order to do this do i HAVE to have another device? Why cant i switch from camera to view and watch the footage from the same device?

What are you watching all day long