That was an enjoyable movie, aside for the fact that the writers thought fiber optic cables are used for hidden cameras.
Even today, a non-CIA-grade camera head is probably 2-3mm across and the optics on a fibre optic can be far narrower.
You can only have a pinhole spy cam if you have a void directly behind the pinhole.
But even if you have some ultratiny thing hot out of a classified lab, fibre optics also keep the active electronics further away and harder to detect.