On bigger Poway lots, the line from the house out to the street can run a long way. A backup at the sink doesn't tell you whether the trouble is 10 feet out or 90. Without knowing that, finding it means digging up your yard in stretches until something turns up.
That's what the camera is for. It goes in through the cleanout, the capped pipe outside that opens into your sewer line, and travels out along the line sending back live video, as far as the pipe and the access allow. On a long run that matters, because the cable counts the feet as it goes, so the problem gets marked close to where it actually is, and out here the yard is a big part of the property.