It’s an age-old technique but not one the OTT video industry has embraced until now, as NBCUniversal plans to reward viewers for streaming content with the launch of a new app-delivered service called WatchBack. Online gamers will be familiar with watching extra advertisements in return for tokens or other rewards but rewarding viewers for watching content they may actually enjoy, far from annoying ads, is a new frontier for TV. The idea is simple; get viewers addicted to shows by offering gift vouchers and other goodies then convert them to full paying subscribers – yet the prospect of a full paid WatchBack service has not even been discussed by NBCU. What has been revealed is that the basic reward-giving offering…