According to the Second Life Wiki, the viewer only works on the Aditi test grid, but the submitter of the vid wrote that it also works on the main grid as well. I tried it, and it does work on the main grid, but the sims I was able to teleport to was limited.
The creator of the vid also provided some details as to graphics and debug settings. I made most of the changes, but still didn't get the dramatic effects seen in the video.
"Depth of Field is active by default if Shadows are enabled. Global Illumination must be disabled.
Three debug settings affect how Depth of Field feature works. In this video, I set CameraCoC to 0.010 while I let CameraFNumber and CameraFocalLength to their default values.
I also changed another already-existing debug setting, CameraPositionSmoothing, setting it to 32 (that makes the bouncing camera effect). I usually make my videos with a SpaceNavigator but I didn't use it here."So, I'm not sure if this is just an interesting diversion or something more significant, but it's definitely a different view of Second Life that I haven't experienced before.