int _stdcall start_manual_record_task(int camera, int stream, int period, const char * filepath);
camera:[in]，The camera's handle which is from new_camera
stream:[in]，The video stream number of camera which want to record
period:[in]，How long for this record
filepath:[in]，The record file's save path, if NULL, use default path
>0, success, is a task id, esle is failed
Start a manual record task