Came across this one - not specifically Matra related, apart from it being a young Jackie Stewart explaining the Nürburgring Nordschleife with on-board camera footage:
http://www.livevideo.com/video/Racing/A0D3AA4D92C04245A363FAD4A3118267/nurburgring-1973-f1-onboard-la.aspxI specifically like his comment on the missing guardrails, and that the faster you go, the less time you have to be scared :-)
But think (and listen) of the load put on the suspension and the engine ... amazing.
A more modern approach to showing the speed of F1 cars is the Ferrari/Ferrari/Fiat duel here:
http://www.livevideo.com/video/BFE326FD611649C8BCEEEC1F7E637CDA/f1-ferrari-vs-normal-ferrari-v.aspx/Lennart