The type of camera you'll need depends on where you want to place it. If you want to place one inside your home, there are many home security camera options. If you want one outside your home, you'll need to decide whether you want a wireless security camera or a video doorbell.
For monitoring a front or back door, consider a video doorbell because it can be powered through your doorbell wiring. If you want to monitor another area of your property, you're better off with a wireless security camera. Keep in mind that while all video doorbells are designed to survive the elements, not all wireless security cameras are weatherproof. So be sure to check the specs of a camera you're considering if you want to put it outside.
Security cameras can be stand-alone devices or part of a system depending upon the complexity of your security needs. In order to meet your security objectives, cameras (or signs saying cameras are present) must be visible and the cameras must be able to record, store and transmit footage (or be connected to recorder or system that can do so).
In cloud solutions, a significant part of the cost is the cost of traffic and servers for encoding and decoding video streams, as well as for ai-analysis.
For P2P technologies, encoding and decoding on servers is not required. The server only connects cameras and remote devices.
The video stream is transmitted directly through peer-to-peer connections, bypassing the cloud service.