The best place to ask for SmartTiles Video advice is the Topic below. You may search it for an existing answer or there are folks there who have tried many camera types and combinations.
The general answer is that SmartTiles provides relatively “rudimentary” video support by just supporting stream types that are native to modern browsers, rather than any sort of plug-ins or transcoding servers. We wish that SmartThings would give us direct access to Camera Streams from the SmartThings Hub … then we could offer compatibility with nearly all the same cameras SmartThings supports. For now, however, SmartThings has not given us this option.
Video compatibility will improve in little leaps when we get the opportunity to figure out how to incorporate popular standards.