Looking to start or stop video on your camera remotely? For Canon cameras, this can only be done via compatible infrared remote. It's a nice addition to stick on the handle of your rig so that you don't get those few seconds of unusable video. There's plenty of DIY solutions to route the infrared signal to the camera if the remote needs to be positioned elsewhere. One of those popular methods is by using an Optical Audio cable (like home stereo stuff). These optical cables run the light from the remote to the front of the Canon camera. I just ordered a remote and verified that it does indeed work on both the Canon 5D Mark II and Canon 7D. On the T2i it can fire off photos (no video mode). To initiate video, you'll need to use the S2 button. Total cost was $2.66 + 0.50 cents shipping. Found below (click here).
Wireless Shutter Release Remote for Canon EOS