Keep in mind that some people are just better at gaming then others, and some of them invest quite a lot of time into practice. Even me (as a noob driver) know the position of lamps before I make the turn or see them, just by playing this game for so long.
Making people record their game proves nothing. I can install a fresh new game in minutes and can reinstall a lot of bad mods again also in minutes. In all the years I play this game this suggestion has come up so many times, but no one has every found a "non-cheatable" way to take a proof video.
And at last, you should be very careful at calling people cheater without prove, especially when it comes to long time players and admins. I'm not saying it is not possible for these people to use cheats, but by spreading rumors without having proof, you can destroy a reputation people have build up over years.
You don't want anybody call you a cheater, and then everybody just says "lol hacks" when you make a record, denouncing your achievement?