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There are only three things protecting your privacy - legislation, cost benefit, and combinatorial explosion
Yes, and there are things you can do to increase the cost to your adversary. Of course, for most individuals, the interventions available don't pass a cost/benefit analysis for the individual, even if they might be sufficiently costly to the adversary to be prohibitive.
gbj_tester
There are only three things protecting your privacy - legislation, cost benefit, and combinatorial explosion.
Almost anything can be done with video analytics (if you have enough money and time) but :
For example tracking every UK citizen (60m) through Waterloo station (100m passengers per year) would require 6 quadrillion comparisons. That's roughly the same number of comparisons as there are ants on the planet.
If the system was 99.99% accurate you'd have about 600 billion false matches to dig through. That's 1,644 million errors per day.
So if we all club together and everyone in the country manually checks 30 results each per day, we could implement total surveillance of a single busy train station.