If I write a shem Hashem on a computer screen, there is no issur mechikas Hashem for me to switch the computer off becuase the writing was never meant to stay there in the first place. This is better than writing with fruit juice say, becuase in that case the writing is at least nominally writing which is meant to have some permanence, but here no-one would think that any writing on a computer screen is meant to be permanent in any way, otherwise you wouldn’t be able to continue using your computer to display other things.
The same would seem to apply to walking in front of a CCTV camera, which should be mutar.
I don’t think the notion that ‘the machine (camera etc.) is doing it, not me’ has any validity becuase machines aren’t sentient and they simply do what you make them do.