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gst-launch-1.0-capsfilter: add page (#21753)

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* Create gst-launch-1.0-capsfilter.md

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Co-authored-by: Ivan Baluta <ivanbaluta.dev@gmail.com>

* Update gst-launch-1.0-capsfilter.md

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Co-authored-by: Ivan Baluta <ivanbaluta.dev@gmail.com>
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pages/common/gst-launch-1.0-capsfilter.md
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# gst-launch-1.0 capsfilter
> Filter pipeline capabilities.
> More information: <https://gstreamer.freedesktop.org/documentation/coreelements/capsfilter.html>.
- Filter to only allow greyscale format:
`gst-launch-1.0 {{videotestsrc}} ! capsfilter caps=video/x-raw,format=GRAY8 ! {{videoconvert ! autovideosink}}`
- Do the same but in shortform:
`gst-launch-1.0 {{videotestsrc}} ! video/x-raw,format=GRAY8 ! {{videoconvert ! autovideosink}}`
- Limit video capabilities to specific dimensions:
`gst-launch-1.0 {{videotestsrc}} ! video/x-raw,width={{640}},height={{480}} ! {{videoconvert ! autovideosink}}`
- Specify a specific framerate:
`gst-launch-1.0 {{videotestsrc}} ! video/x-raw,framerate={{30}}/1 ! {{videoconvert ! autovideosink}}`