Comments

massi04 wrote on 12/8/2009, 5:37 AM
First, create an alpha-mask as shown in pic. 1.
Move it to the timeline.
Go to Effects > Chroma Key > select Alpha.
Click on the arrow in the highlighted object to make it point upwards (pic. 2). 
Adjust the video levels as you need them (pic. 3).
Using Size, Position, Zoom etc. it can be further adapted.