camerabin: Mention photography interface in docs
Add a note to docs about getting the videosource and accessing its photography interface (in case it has it) Fixes #616923
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* Available resolutions can be taken from the #GstCameraBin:video-source-caps
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* Available resolutions can be taken from the #GstCameraBin:video-source-caps
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* property. Image capture resolution can be set with
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* property. Image capture resolution can be set with
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* #GstCameraBin::set-image-resolution action signal.
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* #GstCameraBin::set-image-resolution action signal.
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*
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* Some video source elements implement the #GstPhotography interface, which contains
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* functions and properties for setting photography parameters. One can use
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* gst_bin_iterate_all_by_interface() to get a reference to it.
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*
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* </para>
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* </para>
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* </refsect2>
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* </refsect2>
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* <refsect2>
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* <refsect2>
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