Courtesy of our DCFCPUG friends at :
The handle attaches to a quick release plate to which we occasionally mount a gyro stabilizer. This solution works very well and no longer requires the operator to touch the camera to trigger video recording. Instead, just a small thumb press and the camera blinks to life.
This was built specifically for a Canon T2i, but would also work with a 7D and 5Dmk2. Total parts cost about $10.
DCFCPUG Leader and Apple Ambassador