examples: Add an example that registers a custom GstMeta and makes use of it
The meta contains a Rust String as a label for the buffer. It is added on buffers passed into an appsrc and retrieved from the buffers provided by an appsink.
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The meta contains a Rust String as a label for the buffer. It is added on buffers passed into an appsrc and retrieved from the buffers provided by an appsink.