Build a video editor / trivia game program

I'd like to build a program that can take youtube or vimeo clips, trim the length to the user's preference, and then add in questions for students to answer about the video throughout the clip. As you will see on this example site, it will require students to use a QR code to access a real time quiz game. The users phone will be used to answer questions about the video they are watching on another screen. [login to view URL] Each question is timed and point value goes down as the time to answer goes up. You will need to test out the filmdoo example to see the ins and outs of how it works. We will also need an easy to use interface. We already have a teacher and student portal, so everyone already has accounts. Teachers would be creating these video classes from within our portal so that their work can be saved and shared. [login to view URL]