Well, I have to say the contravention itself seems to be made on from the video. You blithely entered the box with no hesitation at all, but the car in front occupied the only space, thus forcing you to stop.
However, don't rush to pay yet, bcause experts on here are very good at finding flaws in TfL's management of the enforcement process, so wait a bit, but don't miss the deadline for payment or submitting reps if nobody answers.