HIJustin
Free :
You can use the free screen capturing codes like window media encoder
from Microsoft to save a powerpoint presentation as a video
presentation and burn the video to dvd with a burner.
Or you have a camcoder , just video tape it
However, the video quality can a big issue.
Paid:
Google "powerpoint to mpeg/dvd " and you will find a lot in the market.
And you may have a glance at PPT2DVD from
http://www.ppt-to-dvd.com
Rather than screen capturing , this tool encodes a powerpoint
presentation to a video one so that the video quality is really
improved.
Besides, you can also create menus for the video on DVD.
If you are concerned the conversion quality a lot, paid programs will
be better.