Once you have saved the movie clip, the detail of how to insert it into Powerpoint is located in the Powerpoint help file, under 'Add a movie or animated GIF to a slide'.
That's the easy part - the hard part is to 'rip' the movie from the CD. There are no easy methods, as DVDs are supposed to be copy-protected (copyright issues were uppermost when they designed the DVD format). I suggest you search Google for 'free dvd ripper', or suchlike.
It is not a simple, quick or easy process.