using webcam with OpenCV

webcam.rb

#!/usr/bin/env ruby

require 'opencv'
include OpenCV

FPS = 30
input = CvCapture.open
win = GUI::Window.new 'video'

loop do
  img = input.query
  win.show img
  key = GUI.wait_key 1000 / FPS
  break if key and key.chr == "\e"
end