Finding them is alot harder now thanks to FOMs campaign of terror but they're still around. The F1 50 years on board DVD is also well worth buying for the lap with Senna round Suzuka alone.
Google video has some, you can download them and play them in the google player (or VLC and others once they've been fully downloaded). Don't know about converting them to get them into your presentation but you could play them as video clips with no need for an internet connection.