A visit to a passel of slow-moving, decades-old tortoises shows The Wall Street Journal eager to accelerate its video ambitions. Gunjan Banerji , a reporter for the News Corp-backed outlet, recently traveled to interview hedge-fund manager Bill Perkins , and was able to feed one of the reptiles, which he keeps on his estate. She hosts “The Wall Street Journal Money Interview” — referred to internally as “TMI” — which features candid conversations about everything from how to manage family spending discussions to philanthropy. The first cycle consists of seven episodes, and, says Maral Usefi, head of video for WSJ, there is hope for a second. The Journal, once known primarily as a print vehicle for business news, has in recent years had to grapple, like many of its contemporaries, with an accelerated transition to digital. As part of that effort, the company, part of News Corp.…