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Hi there,
First find out if the web cam streams video or not? Typically they would stream the video to a particular port. You can then open a Socket in C++ on that port and get the video data. Most webcams should be able to do this.
The main thing here is you need to understand what video format does the webcam use and how to process it. Silverlight or DirectX will help as they can directly listen at the particular port, but you have not mentioned which OS you are using.
In case the web cam does not stream it should at least have the feature to save video to a file. In this case also find out the video format and that should help you decide which API to use.
open a terminal type ( gstreamer-properties ) click enter
click video tryv4l1 or v4l2
this is to see what it use for a driver
get a program like ( cheese or wxcam )
to make movies or take a picture
vlc player can do stream too
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