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PiCamera

http://picamera.readthedocs.org/en/release-1.4/

Install:

$ sudo apt-get update
$ sudo apt-get install python-picamera

Funktion for Camera Preview:
color_effects

  camera.color_effects = (u, v)
* contrast
* crop
* framerate
* hflip
* image_effect
* preview_alpha
* preview_fullscreen
* preview_window
* rotation
* saturation
* vflip
* led

Example:

import time
import picamera
with picamera.PiCamera() as camera:
  camera.start_preview()
  try:
      for j in range(100):
          camera.preview_fullscreen = False
          camera.preview_window = (100-j, 100-j, 1000, 500)
          time.sleep(0.2)
  finally:
      camera.stop_preview()