I always get frustrated when people refer to any random pseudo-3D gimmick as a hologram. A hologram is a specific type of technology which records interference patterns from which an approximation of the original light field can be reconstructed, such that you can look at it from different angles and see the original scene from different angles.

Other forms of pseudo-3D, like these human-shaped rear projections screens or people spliced into a scene using chroma keying and multiple camera angles (as CNN's "holographic interview" works), are not holograms.

There are people at MIT who are working on real holographic video, but of course, the technology has some substantial limitations: http://obm.media.mit.edu/

There's nothing wrong with alternative forms of presenting pseudo-3D imagery and video. But I wish people didn't call it all "holograms", because that leads to confusion rather than clarifying what's going on.