Yup. It would need to be a very sophisticated plot.
You would need several operatives in a hotspot area with ready cameras in case of an incident.
You would need a "useful idiot" who could be encouraged by his handlers to do something violent . It takes time to cultivate such people and they would not be very reliable, so you would need several of them in the pipeline at any given time.
You would not be able to tell exactly what might happen (if anything), but if something did, the odds would favor that one of your cameramen gets a recording.
The key factor after that would be to get any available recording to useful media very quickly.
None of these things is beyond the capabilities of our Government or even of a well-funded private organization. Perhaps there are even volunteers who might participate - with suitable direction from the handlers.
But of course it is all just a crazy conspiracy theory that can be dismissed of hand.
I wouldn’t say dismissed out of hand but at least some attempt made to calculate the probability. Seems to me, vanishingly small. More likely, as we all did, this CIA guy just realized something was going to happen and he ran around recording everything and got lucky.