Function gstreamer_video_sys::gst_buffer_add_video_caption_meta

pub unsafe extern "C" fn gst_buffer_add_video_caption_meta(
    buffer: *mut GstBuffer, 
    caption_type: GstVideoCaptionType, 
    data: *const u8, 
    size: size_t
) -> *mut GstVideoCaptionMeta

This is supported on crate feature v1_16 only.