Release the resources after the program is ended.
BOOL NET_DVR_Cleanup( );
Returns TURE for success, and returns FALSE for failure.
If FALSE is returned, you can call NET_DVR_GetLastError to get the error code.
The available error codes may be returned by this API are 0 and 3. See details in Device Network SDK Errors.
When calling this API, you cannot call other APIs at the same time.
NET_DVR_Init and this API should be called by pair. That is, once the NET_DVR_Init is called, you should call NET_DVR_Cleanup to release the resources when exiting the program.