None of the members in the team knew about React. But, however we built the entire service using React by learning it's concepts and implementing it. The biggest hurdle we got was after we had completed 20 hours of the hackathon and we realized that there was a bug in the API we used itself. We were actually using an API for Video Conferencing in a decentralised manner, but when we finally reached to capture the user using his webcam, the API code which would request for user's camera permissions didn't work. We are still unable to find a workaround, because it would be worth starting from scratch.
We, however implemented the Audio Stream sharing, but then we encountered a bug in our web app where we were unable to output the audios captured from other peers.