In order to embed the video you have created into a Power Point presentation, you first need to convert it to a .wmv file. All movies need to be in that format to play well with Power Point.I have created a video tutorial to show how to do that with a program I talked about earlier, VideoLAN.
Assuming you have downloaded that program, click the tutorial link below, there is also a .pdf file of the steps needed to convert a file using VideoLAN.

Video Tutorial

Converting Flash Document

When that step is complete, you can simply go to the page in Power Point you want to embed the video and follow these steps.1. Select “Insert” then “Movies and Sounds” then “Movie From File”
2. Browse to the file you want to embed and select “OK”
3. it will ask if you want it to play automatically or when clicked, I suggest “When Clicked”.
4. Test your slide to make sure everything works!