the name of the #GstEncodingTarget to load (automatically converted to lower case internally as capital letters are not valid for target names).
the name of the target category, like #GST_ENCODING_CATEGORY_DEVICE. Can be null
The #GstEncodingTarget if available, else null.
Searches for the #GstEncodingTarget with the given name, loads it and returns it.
If the category name is specified only targets from that category will be searched for.