8 years ago promotional video:

https://www.youtube.com/watch?v=z78mgfKprdg

also technology 8 years ago (luckily miniaturization a bit stopped):

https://www.youtube.com/watch?v=4o7mRg74qcY

look also: https://www.youtube.com/watch?v=YQIMGV5vtd4

https://www.businessinsider.com/government-collected-dna-and-future-micro-drones-are-downright-scary-2012-10?IR=T

Currently:

https://www.youtube.com/watch?v=KLmmPnMvwNY

Commercially availabe drones with camera - of course made in China unfortunately are sometimes even about 40$. So still it isn't cheap,but it is cheaper and cheaper.

And actually by using swarm you don't need to make every "bullet drone" having camera so it can be accessible too soon.