The movie explores the often-unpredictable bond between the three main characters and how it intersects with their joint passion for professional tennis
The attempt, by the country's National System of Youth and Children's Orchestras, known as "The System", would beat a Russian record set two years ago and will be judged by Guinness in the next 10 days.
"The System" counts some 350,000 children and youths among its rank, playing in a network of 180 orchestras.
Saturday's musicians, wearing white, played Piotr Ilich Tchaikovsky's Marche Slave for 10 minutes at Caracas' military academy.
"It is a pleasure to be at the official attempt via video," Guinness expert Susana Reyes said.
The current record was set in Saint Petersburg, when 8,097 musicians played together.