how to work a integrated camera on my computer in wpf(c#)?

Hi all,I have need to open/access integrated camera on my computer through pragmatically using  .Net classes. and give raw data to manipulation it.Same work done in windows phone by usingPhotoCamera class. Which  .NET classes that allow you to access integrated camera on your computer?.How to work with grayscale in a camera app for Windows8 using wpf?