I suppose that you are using the meta-qcom BSP layer, as per https://github.com/96boards/documentation/wiki/Dragonboard-410c-OpenEmbedded-and-Yocto.
Gstreamer plugins for DB410c video playback exist, but we haven’t added the OE recipes for that in this layer yet. In fact someone submitted a pull request with the support, but I have not had the time to look into it yet:
I am planning to work on the meta-qcom a bit in the coming days/weeks, with the goal to have ‘feature parity’ compared to our latest Debian release. So that will include adding/merging the Gst support , among other things.
If you can try the pull request and provide feedback/test in the mean time, please let me know.