OpenCV video preview and start record

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Hi

I am developing iOS video project using opencv for facial recognization.

I have one problem with opencv. cvVideoCamera does not have the start record and stop record function.

Of course cvVideoCamera has start and stop methods, so I can save the recorded video but I need preview the video...

Have you any good idea to preview the opencv camera?

How can I make start record and stop record function?

Kind Regards.

Hua.