* Most important resource that is released here is gstreamer pipeline of mm_camcorder.
* Because most of resources, such as camera device, video display device, and audio I/O device, are operating on the gstreamer pipeline,
* this function should be called to release its resources.
* Most important resource that is released here is gstreamer pipeline of mm_camcorder.
* Because most of resources, such as camera device, video display device, and audio I/O device, are operating on the gstreamer pipeline,
* this function should be called to release its resources.