ou can buy this after Effects project and customize it at 
http://videohive.net/item/whiteboard-write/1614724?ref=pixelgr
Music Track available at 
http://audiojungle.net/item/clapping-ukulele/409141?ref=pixelgr

Fully Customizable
Help Video Included for Easy Customization.
Includes 2 Animated Fonts with complete alphabet in capital letters, all numbers, 
and some special characters. (each character is an individually animated composition)
7 places for illustrations (includes four extra original animated illustrations)
Color Pickers for Color Changes
3 placeholders for images or videos
17 text placeholders
Includes 3 Render Comps -- 1920×1080, 1280×720, 720×480