Hi, Matt S Rinc here and I can help you - a multimedia pro and a PowerPoint guru for 20 years.
Enough said - I have a lot of experience in creating VSLs (Video Sales Letters) that use PowerPoint the same way as you require.
I need one day only, looking forward to your reply,
Matt
P.S: I can also screencast and provide you a video at 1.280 x 720 pixes, high quality QuickTime video for free (so included in this bid).