Video monitoring and video verification serve the same purpose; to keep a facility secure, but the methods by which each system achieve that goal are fairly different.
Video monitoring involves teams of security specialists observing real-time footage to proactively prevent threats before they ever occur. The specialists utilize motion-detecting software and analytics to notice abnormalities, and can proactively speak through loudspeakers to deter intruders before further events unfold.
Verification, on the other hand, reacts to security breaches after a threat has been observed. The footage from an event is sent to a security company, which validates whether the threat was genuine or a false alarm. If genuine, the authorities can be alerted to respond to the incident after its occurrence.