The photos on the PCN are taken from the video. You can ask to see this by phoning TfL who send out a DVD, (yes, they're a bit behind the times, I'm afraid). They allow a fortnight for this, so put the PCN n hold, but when it's posted they restart the clock. Needless to say, they don't tell you it's on its way !
Frankly I think the driver is bang-to-rights on the contravention itself, but what I said about camera approval may be a runner, but I doubt it. PCN looks OK.