Here is a handy kit that makes capturing difficult panning shots a whole lot easier. Rhino Arc is a motorized solution with automatic subject tracking, so you can use it for interviews and other comparable settings. Arc can rotate your camera 360 degrees. It has an OLED screen to show the status of the device.
You can use cameras up to 15lbs on this. Rhino Arc could prove helpful for time-lapse videos. More info is available here.