Though it seems to me that if your espionage techniques rely on never being seen on camera, you're screwed almost regardless of how much computer support you have; doing the job right requires that you be so unremarkable that someone looking right at you won't see you for what you are, even if they do have a camera trained on you.
It's not "never be seen on camera", it's more like "never be seen on camera doing stuff you shouldn't be doing".
For example, it would be trivially easy to program your capital's monitoring system to track moements of all foreign diplomats ; Then if you see them sitting down on a park bench with someone, set it to track that someone and *BAM* spy ring cracked.
So logically a lot of effort would go into spoofing, circumventing or outright avoiding such security measures ; And it wouldn't be enough to just find an unmonitored spot, since an extensive system would also be able to tell "This diplomat went into that seedy bar in the bad part of town and returned two hours later ; Flag him, he's obviously a spy.", you'd need to be able to hide in plain AI assisted sight, so to speak.
Of course, some techniques would be pretty much immortal, like the "bump drop" where you bump into somebody in a crowd at a predetermined spot and drop something into his pocket. Others would die out quickly due to extensive monitoring networks, and you'll see a lot of virtual communications, temporary wireless networks (like you meet a contact by renting a hotel room, setting up a network outside of local infrastructure, conduct the meeting with a guy sitting in a cafe across the street and scram), data mining, lots of virus/countervirus planting etc. (Legion likes to corrupt every network he can with programming "for later", for example)
Funny question: if a Umerian embassy AI corrupts a Solarian CI into being an agent, does he get diplomatic immunity?