Kieran O’Dea rises at 5 a.m. to begin his daily routine, shuffling to his desk to eye his portfolio: a cluster of biotechnology stocks and a bet that Tesla will go bust. Then he pulls up the latest video on Real Vision, the start-up financial video service that promotes the trading ideas and insights of hedge fund managers large and small. On this morning, the play is buying beaten-down Chinese stocks. He studies the clip carefully, as he has done with all 1,200 videos shown on Real Vision since it went live in June 2014.