title: Accessing USB webcam via Cortex-M3
body: <p>Afternoon all,</p>
  
  <p>A am wondering if it is at all possible to hijack the video stream of a USB webcam via a microcontroller (STM32F103, Cortex M3, 73MHz) to add a HUD to the device. Then re-package the stream into the same USB endpoint plus a control endpoint?</p>
  
  <p>I can not find any information what so ever on interfacing with a webcam via a micro, but I have found projects that use a parallel interfaced image sensor.</p>