dont forget you can check other open source projects (videolan, virtualdub etc) and maybe copy how they do dshow video capture.
There is also this library: https://github.com/jp9000/libdshowcapturejp9000 is the author of OBS, libdshowcapture is directly based on its Video-Device-Capture. It supports a lot of troublesome devices which need special treatment and is definitely worth a look for this.
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