Find the #GstVideoMeta on buffer with the lowest id.
Buffers can contain multiple #GstVideoMeta metadata items when dealing with multiview buffers.
a #GstBuffer
the #GstVideoMeta with lowest id (usually 0) or null when there is no such metadata on buffer.
Find the #GstVideoMeta on buffer with the lowest id.
Buffers can contain multiple #GstVideoMeta metadata items when dealing with multiview buffers.