What the camera can show
A camera can show root intrusion, standing water, offsets, cracks, broken pipe, pipe material changes, and the approximate location of defects.
A locator can often mark the surface location and depth, which matters for repair planning.
What to request
Ask for the video or screenshots, the marked location, approximate depth, and a plain explanation of whether cleaning, repair, or replacement is recommended.
For a large quote, camera evidence should be part of the decision.
When to treat this as urgent
If sewage is coming up through a floor drain, shower, tub, or basement toilet, stop using water in the house and get help quickly. Do not run laundry, dishwashers, showers, or extra toilet flushes until the blockage is understood.
If only one sink or toilet is slow, the issue may be inside the home. If several fixtures are slow or the lowest drain backs up first, the main sewer line is more likely involved.
What to ask before approving work
Ask whether the contractor has camera evidence, where the defect is located, whether cleaning alone is enough, and whether repair or full replacement is being recommended.
For expensive work, ask for a written scope that explains access points, restoration, permits, expected timeline, warranty, and whether trenchless repair is possible.