Technically an ALIBI is not an affirmative defense, so the burden does not legally shift to the defendant, but when summed up, it does.
If he asserts his 5th AM right, what recourse does the court have in deciding it was or was not him?
The camera, or so called "silent witness", is not, of course human, but is just as just as good as a human eyeball who sees ONLY a license plate.
It's similar to an illegal parking ticket, the registered owner will get the ticket on the windshield, not the driver, as s/he is not there. That constitutes a prima facie case. If the owner was not driving, then his alibi, or defense, will have to convince the trier of fact that.
If he does not answer the summons due to the fact it was not him driving, he has bigger problems. He must plead such.