There are a few different ways to do this, but greenscreen is definitely not what was done in this example. You could certainly try greenscreening it, but it would be a lot more work than necessary and you'd probably get lesser results.
This is simply a transition between different angles. Let's say you have 2 different angles that you are using. You shoot the first angle, then at the end whip pan the camera to the left. Start shooting angle two by whip panning in from the right. So now when you edit, the ending of your first clip and beginning of your second clip can be blended to make the transition seem like it's one continuous shot. Adding motion blur can help sell the effect.
This can also be done with footage that was already shot without the pans, though it will take a little more trickery. But if you have the advantage of planning this type of shot beforehand, then you're better off shooting with the pans. Just try keep the same speed on your pans as much as possible.
