Once you have installed the application from the company CamStreamer and activated any cloud service on a particular camera you can automatically use also CamStreamer ACAPs API.
It is possible to control the API of all applications without the necessity to be in the same network as the camera. All you need is to use the device-connect.net domain together with the serial number (https://serialNumber.device-connect.net/) and with DEVICE_ACCESS_TOKEN.
With this implementation starting of streams, switching output cameras or graphics can work flawlessly even remotely within your integrations.
It is also possible to control CamStreamer App, CamOverlay App, and CamSwitcher App via Control Panel available in the mobile application.
Among other useful functions, you can manage guest accounts and give them permission to access particular cameras and recordings.
CamStreamer offer several application such is CamStreamer(link), CamOverlay(link), … https://camstreamer.zendesk.com/hc/en-us/categories/360001899777--API-Documentation