TOKYO — A facial recognition system will be used across an Olympics for the first time as Tokyo organizers work to keep security tight and efficient at dozens of venues during the 2020 Games. The NeoFace technology developed by NEC Corp. will be customized to monitor every accredited person — including athletes, officials, staff and media — at more than 40 venues, games villages and media centers, Olympic and company officials said Tuesday. Local organizers said Tokyo will be the first Olympic host to introduce the face recognition technology at all venues.