I'll provide about 3 minutes of video (probably 5 or 10 short clips) and text and indicate what part of the screen the text applies to.
No audio is needed (this will be running on a TV at a conference)
You'll provide appropriate transitions and put the text in nice callouts with drop shadows.
I'll have the video for you in about 11 hours and I need it FINISHED 4 h later.
Please let me know how many screencasts you've created before and (ideally) link to an example.
Also, let me know if you have experience with (and will be using) Camtasia.