It's unclear from the video what happened there.
Can you give some more details?
One bird or birds?
Did it attack or warn you off or just come in for a close look?
You got some interesting close-up of it coming in.
That bird is a falcon and looks like a Peregrine Falcon.
They always live around cliff sites and kill other birds by diving on them at great speed and knocking the stuffing out of them.
In a power dive it's the fastest bird in the world.
I've had them look interested in my Phantom but I always withdrew rather than see what they could do to a Phantom.
Well I was flying at this rock quarry in So Cal where people off-road and motorcycles ride. They also do rock climbing there. Anyhow I'm flying for about 10 minutes and see these ATV's on the ridge so I take the phantom up there off the ridge and these two birds start flying by the phantom. I immediately pull the phantom back and they start chasing it. I was going 30mph and they kept coming. I landed and left.