Using gro pro / Blackmagic capture card

Hi All, 

New to Blizz, great product. 

I have tried using my go pro / Black Magic Capture card for a meeting but it just gives me a black screen, I have tried playing with the video driver settings but it doesnt appear to work. 

Had the same issue with zoom after their latest update, hence swapping over to this to see if it works. 

If it can take a go pro i will be swapping over thats for sure. 

Thanks 

John