Using iPhone 4s camera to record video live on OS X

I have a late 2010 13" MBP. I have OS X 10.9.5 installed. Also I have iphone 4s. I would like to record video directly from my iPhone's HD camera to my computer since I can't record long videos because I only have 8GB on my iPhone. I tried to use iMovie but when I select the iphone camera, it only shows the videos I have on my iphone. I want to record from the camera directly! However choosing the iSight camera from iMovie, it allows me to record. This is very strange.

Any ideas?