It’s very unlikely that you’ll ever see streaming audio or video, or for that matter still video, distributed over a mesh network like Z wave or Zigbee. Those networks are intended for low traffic with very small message packets, and the messages are allowed to bounce around the network and consequently may not arrive in the exact order that they were sent. This is why almost all video applications are done over Wi-Fi or ethernet or point-to-point Bluetooth. Those networks use a different messaging protocol which is very appropriate for large messages, much busier traffic, and can enforce sequencing.
All of that said, one of the points of the smartthings vision is that it can support multiple protocols. It currently allows for the access of some Internet services. This is how the IFTTT channel works for example, but also weather.
The camera itself does not have to communicate by zwave. There just has to be a way for it to exchange command level information with the hub, even if this is cloud to cloud messaging. Then you would need some way of making a Wi-Fi connection displayed on the monitoring device you want to use.
there are several systems under $2,000 that mix together wi-Fi cameras with home automation hubs that also control zwave and/or zigbee devices like motion sensors or contact sensors. Many of smartthings competitors do. Two of the most popular camera brands for this purpose are dropcam and foscam, as you noted.
So the real question isn’t finding a Z wave camera. Most likely the camera will always stream video over Wi-Fi. The real question is when smartthings will provide integration with at least one of the popular Wi-Fi cameras.
Reportedly they are working on some integration, but it may need to wait for the version 2 hub. And no scheduled delivery date as of yet.
If you search the forums for camera or a particular camera brand, you will find many discussions of how people are currently using them and what they hope for in the future.