This footage has not been sped up; it's actually running around, or even faster than, full speed most of the time! There are a lot of OpenGL specific bugs, but they'll be worked out in time. Credit to the hardware renderer goes to https://github.com/tfarley
In it's current state the OpenGL renderer isn't currently planned to be merged into master, but it goes to show how much of a speedup there will be when one is finished.
As usual, you can find more information about Citra at its website, http://citra-emu.org/
The code is all open source and can be found on github, with the main repo located here - https://github.com/citra-emu/citra