We can't really offer any meaningful advice until you get a PCN, and we can see the video, which is their only evidence. However, don't delete this thread yet, wait a bit, as sometimes PCNs can be served quite late. They have 28 days for from contravention date to serve one.
Is the car yours or a lease/hire car, and if it's yours, is the V5 address up-to-date. Check it now and report, don't just say "yes". Cases go belly-up when a V5 is out-of-date.