Punch in, set focus, change aperture, and start/stop video with your Canon DSLRs from a remote video handle. Here's a look at the new Aputure VG-1 V-Grip USB Follow Focus Video Remote Handle
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For those unfamiliar, the Canon DSLRs can communicate certain camera settings through the USB port. USB remotes have been around for quite some time, but not many are designed in a comfortable handle-like form factor, and certainly none in this price range.

Aputure VG-1 V-Grip USB Remote Follow Focus Video Trigger mounted on 15mm Shoulder Rig
The Aputure VG-1
can control focus from an Auto Focus Canon EF lens (not manual lenses), and at times can appear smooth, but this will vary on different auto focus lenses. It uses a type of 'stepping' to get from point A to point B. To help achieve a smoother transition, you can change the size of the steps within the VG-1 remote.
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Aputure V-Grip VG-1 Remote USB Follow Focus Handle
The VG-1 handle connects via USB, and for extended runs you can pick up an inexpensive USB cable with a repeater (like this). The ideal use of these remotes is when operating a camera from a distance, such as a 30 foot crane, or on a stabilizer where both hands are occupied (fig rig, 3 Axis Gimbals), or to replace one handle on your shoulder rig. Check out the product page for more information about the new Aputure VG-1 V-Grip USB Remote Handle (found here).

Aputure V-Grip VG-1 Remote USB Follow Focus Handle
For USA residents, the VG-1 Remote is also available via Amazon (found here)

Aputure V-Grip VG-1 Remote USB Follow Focus Handle