New Delhi, Sept. 28 -- When was the last time you picked up your phone to scroll endlessly through videos mindlessly? Chances are, it was just a few hours (or minutes) before you began reading this story. Advertisers are pouring more attention and money into vertical video than ever before, all in an attempt to reach the widest possible consumer base as Indians stay hooked to that infinite scroll of 30-second videos.

Yet, as chasing eyeballs on social media becomes increasingly expensive and with steadily diminishing returns, advertisers are progressively pouring ad money into connected TVs.

While costs for digital ad spots can vary wildly by an advertiser's industry, size, reach, and how much inventory they are buying, in general, 10-2...