Yep, that's Notre Dame, not Westeros. And it's far from the only familiar landmark in the video, which includes oddly modern skyscrapers.
I'd love to see a series set in a fantasy world that has evolved to the same technological stage as ours, but that isn't what's happening here. Just an artsy metaphor again.
The way it ends is cool, though (if slightly spoiled by the title and selected still of the clip). Check it out after the jump.