Is there an online video server that can show paneable extremely large videos? I want to turn a set of high-resolution satellite images of the Earth (10,000x10,000 pixels) into a time-lapse video. But instead of downsizing the images, I would like that people could zoom into specific areas of the video in real-time, and pan through it.

Is that possible?

Is there any web player with such feature?

I've seen videos of cameras that film in all directions and as the video plays you can choose in which direction to look. How is that technique called? Something similar would be extraordinary.
With current technology no, you "can not"; and with more powerful technology it is a waste of resources.

You do not need to stream a gigapixel video, you need to stream a video, receive the new "interest" zone, process the coordinates and display a new version of the video. Even arrange different chunks of different videos.

This is what google maps, bing maps or other applications do. They do not send you all the photos of the planet, just the ones you need.