DirectShow expert required, to capture BlackMagic Capture card. (may use SDK c++ code to access in python widget)

our task is to capture video streams through a Blackmagic capture card. this can be achieved by 1. DirectShow: using DirectShow one can programmatically access the capture card. interface already available. 2. Use existing Blackmagic SDK (c++ running code) use in python and run received video stream on a widget. 3. any other desired way. we need to run the captured live stream multiple times on the screen. you'll have to work on a remote machine having a capture card etc.