OSD (On-Screen Display) specification.
@type t() :: %Onvif.Media.Ver10.Schemas.OSD{ image: term(), position: term(), text_string: term(), token: term(), type: term(), video_source_configuration_token: term() }
@spec to_json(t()) :: {:error, %{ :__exception__ => any(), :__struct__ => Jason.EncodeError | Protocol.UndefinedError, optional(atom()) => any() }} | {:ok, binary()}