Not too sure about this notion. It seems to rely on rather a lot of trust that those taking part have the best motives. Surely those wishing to further the fundamentalist cause could also take part and deliberately ignore any evidence.

Even those not of such a bent could quite easily miss something. I’d imagine that it would require a lot of concentration to analyse CCTV footage - I’m not sure that the average office environment would be ideal.

However, maybe a way around these problems is to to value the assessment of several independent viewers that are all consistent.