Is it possible for someone to replace video feed with prerecorded video on an NVR camera system like Lorex?

Are there any known methods of taking a video feed and falsifying it on an ethernet based camera system?

There's an employee that uses things like kali linux OS and miscellaneous hak5 devices and has previously gained access to the companies network... so I guess they could maybe be considered "a hacker". The employee reclines in the office all night and probably sleeps, but is never caught. You can't open the door to the offices without waking them up, and you can't bust them sleeping because they're awake by the time you get to their door within the offices.

There's a Lorex video system with an extra channel, but it would be installed in an area where they would have direct access to the ethernet cord and no supervision. Is it possible for them to fake a video feed so that if I'm viewing the feed I see a fake video loop?

I've seen there are ways that people have faked video feed using OSB on ZOOM and wanted to know if there are any known methods that I myself am unaware of that could be used to provide a fake video feed to the NVR. I wouldn't say we're dealing with Mr. Robot, but they're definitely not your average joe.

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from hacking: security in practice https://ift.tt/oTgOhnP