Sam2- I have not learned hilchos kesiva, but how can it be D’oraisa if a: its not derech ksiva and b: you dont see any ksiva?
2scents- The prevalent minhag is that you are allowed to walk in front of the cameras. A few years ago there was a big tumult in the Old City about all of the cameras there. Allegedly R’ Elyashv said it was assur. (I say allegedly because I am skeptical of any psak that someone said he heard from R’ Elyashiv) Like many other tumults, it died down and almost everyone returned to visiting the kosel on Shabbos.
There may be a difference if there is a screen that shows what is happening which may be closer to ksiva- although temporary- than a recording. One person that I know was told by his Rav to turn the screen off before Shabbos.
Like everything else, aask your LOR.