GHS students start business pairing drones, real estate Grabel and Sherwin also found that websites like Trulia and Zillow allow for listings to upload video content so they decided to provide video content for realtors as well. Using the same technology, Grabel has also recently entered the Greenwich Realtor Association’s video contest with footage from Greenwich Avenue, fireworks on the Fourth of July and people boating. Grabel’s father, Pet…