If you want to view video streams from a camera, you can open the EyeLook app and view the video stream from your device. You can choose between one or four cameras and you can expand each of them to get a better view. You can configure the settings for each camera separately and you can save your configuration.

You can also set the screen to stay on while you use the app and the screen will be black when you set the static effect to on.

This is a free app, so you don't need to worry about any kind of subscription fees.