Building a presentation video
On this question @hasanyasin and I provided you with alternatives for slideshow presentations. Additionally I place here a part of my answer, just for your convenience:


  Anyway, what you wish to do in a video can be achieved by a
  professional non linear editing system, like Sony Vegas or Adobe
  Premiere, of which Sony Vegas is the easiest to learn.
  
  If you are used to Microsoft Based Products (PhotoShop, Corel Draw,
  Office, Movie Maker, etc.) you are almost ready to do it.
  
  The process to place you in front of the moving images, videos,
  transitions, text and other media is called "Chroma Key" and it can be
  reached in the Effects tab of the Sony Vegas 8 (and previous/further
  versions). A video tutorials on how to create the Chroma Key effect
  can be found on youtube by dropping the terms "chroma key sony vegas",
  here is an example: 
                
            
  
  Basically you work in multi layer. Placing in a time line the elements
  in the order that you wish them to appear on screen, adding a
  background, in/out transitions, and other elements. Remember that the
  top layer will be the "front" element on screen. After which you
  insert your blue/green screen video at the very top, apply the Chroma
  Key effect, choose the dropper and select the background in your
  video, after which you adjust the threshold in order not to appear
  like a ghost in the video.
  
  You will need to use the "Event Pan and Crop" tool in order to create
  the "moving" effect for some static items, like pictures and even if
  you wish your videos to "fly" around the screen. Just run a search in
  youtube with the words "Pan and Crop Sony Vegas" and you will get tons
  of results. Here is an example:
  
                
            
  
  And yes...  you can create awesome results in a couple of hours. Give
  it a try and drop us back a link with your published video.


Good luck!