I am no scientist in anyway, but what you said is really not logical.
1.A problem with the camera wouldn't show such way of movement, it would be far more random, and it would last for more time then a few minutes,
its just not how a cctv malfunction would look like.
2.the "tv" is an LCD monitor, again, its a LCD, the only way it can malfunction is if this backlight would suffer, or pixel would be stuck(aka dead pixels) and that is not the case
3.Its a closed circuit, all DIGITAL, therefore the phone game wouldnt apply here at all.
The question remains, could it be an insect?
1.What insects emit so much InfraRed light so it will GLOW on cctv?
2.Would an insect be able to move as fast as that object?