Using such search strings to access devices without permission is illegal and unethical. This explanation is provided for defensive cybersecurity education and system administration awareness only.
The search query you're asking about, inurl:indexframe.shtml axis video server Google Dork
An Axis camera with default settings and exposed to the internet (no auth or weak auth) would show:
: Utilize AXIS Secure Remote Access rather than port-forwarding your cameras directly to the public web. AXIS P1368-E Network Camera
The working dork is simply: