Depending on the weight of the camera/camcorder you might be better off with a RAM mount instead of the manfrotto.
http://www.ram-mount.com/
I have a palm sized sony pc1000 and ram mounts are perfect for that. I bought different kinds and u-bolted them to various parts of the bike, the top tube, fork, handlebars etc. I had to modify the mounts slightly to prevent the ball from slipping too far when loosening the knob for minor reframing.
They're not perfect but you'll have the advantage being able to reframe easily with one-hand, with some practice. If you do go this route I can pass on some little tricks with wires that I devised to limit the rotation of the bottom ball. The biggest problem with ram mounts is that the knob releases both balls and this is rarely what you want.
