There have been a flurry of articles about vertical video's ascendancy lately. Vertical 2015 is an overview of the last year's vertical developments, and contains an interesting graph showing the ever-increasing hours spent using mobile screens:
And recently we at the Vertical Film Festival were contacted by a researcher at the Nieman Journalism Lab at Harvard University. The resulting article (or see here for German version) provides insight into the growth of vertical video in the commercial world, quoting the astounding figure of over seven billion vertical videos viewed daily on Snapchat (below).
Although many of these are simply landscape-format videos cropped vertically (see left), a substantial number of them are created vertically from the outset, and the article describes the difficulties this involves, citing the Vertical Film Festival's very own "how to make a vertical video" guide as a repository of technical & practical solutions. Always happy to help... :-)