Remove Strap and Resolve Object Removal

I have a 7-minute motorcycle ride cut, encoded as MP4, with a rear-view picture-in-picture covering roughly half of the runtime. A loose rucksack strap hangs into that PiP shot; I want it gone. The overall... (Budget: £250 - £750 GBP, Jobs: Audio Editing, DaVinci Resolve, Video Editing, Video Post-editing, Video Processing, Video Production, Video Services, Visual Effects)