A Man of Dance (Un Homme de Danse), a celebration of the life of Vincent Warren makes its New York premiere in the Dance on Camera Festival, presented by the Film Society of Lincoln Center and Dance Films Association.   Written and directed by Marie Brodeur, who will be present for the film showing and the Q&A that follows, gives viewers the opportunity to see Warren dancing with many well known Canadian artists.  A native of Florida, Warren danced with the Metropolitan Opera Ballet in NYC, but soon joined Les Grands Ballets Canadiens, where he was a principal dancer and a celebrated figure in the dance world of Canada.   After his retirement, Warren became well known and respected as a teacher, historian and archivist.   The eveing will open with a 10-minute film, Scalamare, with choreography by Jiri Kylian.