Edit my Current Video Uploader on my wordpress theme

my site is a website/mobile app similar to instagram, my website is: [login to view URL] your job would be to Edit current video uploader found here --> [login to view URL] freelancer login ( username: freelancer / password: freelancer ) things needed... 1. rename current file so future updates wont change your hard work 2. now when users click on this link --> ([login to view URL]) it redirects to --> [login to view URL] (this way because when i update theme and it replaces it back to previous upload address, there is no problem) 3. limit video length to maximum 3 minutes only, if video longer than 3 minutes it doesnt reject the video it just limit the video to 3 minutes. 4. my site uses built in ffmpeg, i need the cover photo that ffmpreg automatically creates after upload, to be set as featured image of post. 5. remove option to add url and only show [ add media by upload] (simple to do) 6. If possible add video edit and trim like instagram and filters. (discuss before adding to BID)