Microsoft shows how to make mixed reality videos with HoloLens Spectator View
Microsoft released a couple videos that show the possibilities of creating mixed-reality video. They released a model for 3D printing that allows a HoloLens to be mounted on a DSLR camera and the results are pretty fantastic.
https://www.youtube.com/watch?v=DgIHjxoPy_c
https://www.youtube.com/watch?v=aKX8UMejtWc
For those of you who saw this:
Minecraft presentation
at E3 2015, this is how they made the video. I wish I had a second HoloLens so I could experiment with this! (Oh, and a DSLR camera...:apologetic: )