This repo was forked from gstreamer-d3d11-overlay, and tweaked to build a reusable WPF component that can be used by a d3d11videosink to render video inside a WPF application.
By building and using the nuget package in samples/GStreamerControl.Library, you can add a GStreamerView component to your application and then connect the videosink to the View like in Playback.cs in the sample:
sink["draw-on-shared-texture"] = true;
sink.Connect("begin-draw", VideoSink_OnBeginDraw);
See the sample application in samples/GStreamerWPF/GStreamerControl.Demo.Direct for details.