how to record real time video from a usb camera?

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Hello, I am creating my video_object with the following line:
vid = videoinput('pixelinkimaq', 1);
I know how to set my ROI, and how to set my FrameRate.
What I can't manage to do is how to record, lets say 1 sec of video.
I'd like to define the NumberOfRecordedFrames and then initiate the recording
start(vid) % right?
if NumberOfRecordedFrames = FrameRate, then recording should stop after 1 sec.
I'd like the recorded movie to be stored in some workspace variable.
Can someone help please.
Thank you.
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