
Hows this?
I did it with 3 layers:
1: MATTE – GS Footage with Saturation turned up high, until green peaks out. Then add Keylight, and adjust until the hair is still visible, but background is clean.
2: FG – GS Footage, put below the Matte, with TrkMatte set to Alpha Matte. This takes the Alpha channel from the above key. You can also add another instance of Keylight, turn on Colour Correction, then turn on Spill Suppression — although, your footage didn’t really need it in this case.
3: BG – Roadside footage, with levels and saturation adjusted, and Camera Blur effect added.
You’re welcome to the CS6/ CS5.5 project files if you want it.
4997_keyvincerapidpicscs5.5.aep.zip
Vince