I did a similar exercise late last year, using opencv v4 beta and python. I defaulted to py3. And immediately had problems, even with example-ish code. Camer

I did a similar exercise late last year, using opencv v4 beta and python. I defaulted to py3. And immediately had problems, even with example-ish code. Camera misconfiguration and intermittent latency excursions, IIRC. So I backtracked to the "road well traveled" of py2. Which just worked.