You realize that if they really wanted to push it, if you were to try and show a screen shot or video of the incident...
...they would want to examine the whole system as installed in the car, test it...AND want to view the rest of your video/screenshots.
In other words, they may find more things that you don't want them to know.
It isn't like you can walk up with a photo and say "see I'm innocent". That will never pass...they will assume it was edited.