Now almost every laptop on sale already has a built-in camera. It is more difficult to find a model where there is none. For those who are afraid of self-tracking, it is difficult to find a working tool. Once, after the appearance of the animal in the apartment, I was puzzled by the question whether it is possible with the help of iPhone to observe what is happening at home through this very camera. Because, in spite of the harmless size of the cat, he was acting like an adult. In App Store itself, no solution was found, but still there is a service that allows you to do this … 
The service is called iSpy and allows you to create a video surveillance system using simple and affordable devices in everyday life. For these purposes, the built-in laptop or connected web cameras are suitable. First of all, you need to register and install the appropriate software from the site:
ispyconnect.com
From this moment on, everything that happens in front of the camera can be viewed online on the web page of your office. In addition to the live broadcast, there is also an archive of all recordings from the camera. The program itself, which is installed on a laptop, has a lot of settings. You can set the timer recording settings after a certain time. Or to start recording when there is movement in the frame, and adjust the sensitivity of the motion sensor. 
And most importantly, the office is adapted for viewing from iPhone. When you enter from a smartphone, you see a mobile version of the site, which is not inferior in functionality to a regular application from App Store. You can quite comfortably watch a live video broadcast from a laptop camera on iPhone, if the Internet speed allows. Or view the recorded video files on your smartphone. 
And now about the sad thing – iSpy is a paid service. You can use it for free if you watch videos from the same network. But it is worth changing the IP address of the mobile device, that is, to enter the Internet through a different router to which the camera is attached, as you are accurately sent to the payment page. But all settings with recording and storing video files on the server work in free mode. It is quite suitable for tracking the presence of cats in the room. 
In principle, this service for viewing video from a laptop camera on iPhone deserves attention, but as a fire option. Now for little money you can buy something more specialized. Standalone webcams cost less than $ 100 and are significantly more functional.