I have this project going on as an intern at this show and they expect me to use Adobe Aftereffects to edit out content of this banner .Avi footage I have... They want me to change the texts, in motion along with the moving banner. Any idea how I can tackle this problem here? Sorry, I'm new to adobe after effects and more familiar with Adobe Premiere..
If you can show a sample of what you're working with, we will have an easier time helping you.
From your description so far, this does not sound like a simple task.
Note that After Effects is not an application that you can just jump into using on a complex project without first learning the basics. I strongly recommend that you start here to learn After Effects: http://adobe.ly/bjBT3P