I’ve struggled with it a bit myself. Do you see the stream in your browser? You can also check the camera device related variables in SmartThings Groovy IDE to see how the full streaming link looks like.
Have one working fine (takes 5 pictures when back door is opened or closed)
Video I have not been able to get to work. It was working with another vendor’s automated alarm system so I know it can work. Looks like the new smart things app won’t let me use the old code (unsupported camera)… so I will try to create a new working app