I haven't watched the youtube video (darn filter/firewall at work!), but recently I had issues with my 7010L at about the same temperature. The camera was still available on the network, and was writing motion detection events to my NAS. However, it stopped writing continuously to my 32Gb microSD card. It's almost like it didn't recognize the SD card, as it wouldn't reformat it through the onboard software. I had to physically remove the SD card and reformat it using my computer. Once I did that and reinstalled it in the camera, all was fine - even though the temperature was still in the -10C range. It has continued to work fine.
I kind of think this was an issue with the microSD card itself, but just wanted to pass along my experience in case it helps anyone.