Interesting video. He proofs to "know" how to dismantle the first cam, however he "forgot" to completely disable the second set? The unplugged UTP cable intriges me: was that from another cam/floodlight/ir beamer?
In any case, if I was you, I'd grab a couple of additional cams, or, if wiring is a challenge, you could throw in a couple of dummy cams in the corner of your garden. Don't take the ones with these flashy red leds, but some light glowing "fake" IR leds. And add some motion trigggered flood lights. Not only your intruders can be "flashed" and "surprised", your footage might be better too (except if you aim the beam into a cam). And last but not least: if the border/gate contains a mailbox, you can hide a cam in it facing your house, so when the intruder jumps into his car, he might take off his disguise, and you might have a better view.
Oh, and buy this: