Is there puller for controlling the lens focus when using a glidecam? Is there also something similar for the zoom, in case it's a zoom lens?
I have not found anything off the shelf that I can buy online.
I don't think there is anything specifically made for use with a glidecam. My impression of most stabilization systems is that you still operate the camera directly, you just are not supporting it without the stabilization. I'm not aware of any follow focus/pull systems that are designed specifically for use with a gimble or gimble and spring-arm stabilization system.