In this video tutorial you will learn how to remove green backdrop and replace it with another image. Green Screen Technique is needed by most vfx artist for compositing, and hopefully my tutorial will make your workflow using blender a lot more easier.
Download the 4k footage from Blender Foundation latest movie here http://mango.blender.org/production/first-original-footage-frames-in-4k/
Download the finished blend file here http://db.tt/crc4LcEw (I've revisited the blend file and adjust it so it's more friendly :D)
You can also download the blender theme that I used in this tutorial here https://studiollb.wordpress.com/download/
So happy blending and if you find this tutorial helpful, please share to others.