AMCAP is a small size (308KB) and powerful software that enables to control your webcam. I said it is "powerful" because I got very good results with a 20$ webcamera.
Code:
http://www.youtube.com/watch?v=cAmKEkwqqLc
It might be a good idea to implement it as a plugin but AMCAP is not very useful as an external application. To me, I'm not interested in parking aids or any backup cameras. Recording a video in a legible quality is quite important for me. It may be for a track day or a daily drive.
and even more we can make it more complicated by providing some overlayed datastreams like Racechrono or Trackvision. Imagine.
Code:
http://www.youtube.com/watch?v=vqvkANqhtnw
May be I should already have started a plugin request as I'm not a coder.