At SXSW I found a kiosk showing off a beta of the app Gravidi. It allows producers to add a layer of interactivity to videos by embedding hotspots in the video, and adding other activity around it. For users, it provides a way to learn more about moments in a video, or people or objects in that video as it plays. The app is currently in beta, but they are showing it off around SXSW featuring a number of bands and their music videos.
While clickable video has been tried before (I remember adding hotspots to QuickTime video a decade ago), Gravidi is offering a nicely designed experience for users and tools for producers on the back end. The app for consumers will be free, the back end for producers will cost, but no details on price were
