DroidCamX turns your Android device into a wireless webcam, letting you use Skype, Google+, and more
Operating virtually on all networks, you can also use DroidCamX as a webcam, and even as a surveillance camera via a web browser. Use it as a simple animal camera, to spy, or to make security.
+ Discuss using “DroidCam Webcam” on your computer, including sound and picture.
+ Connects via WiFi or USB cable *.
+ You can use other applications while DroidCam is running in the background.
+ Access to a surveillance or network camera MJPEG (access the camera via a web browser or another cellular / tablet / etc.)
+ Support for high+resolution video (up to 720p in HD mode).
For More Info Google Play
varies with device