Optical Cable/Camera Options

[carolinarider09]

I saw an ad for a local company to inspect your HVAC system (air supply).   They used an optical camera, they claim. 

So, I was wondering, who has an optical camera system that could be used for multiple purposes including HVAC duct inspection?   

I don't know what the length requirement might be but it would seem 20 feet would be enough and, of cousrse lighting would be required. 

To make it useful on a motorcycle (like air filter intake inspections) it would also have to be small enough and flexible enough to move though the tubing.