Manual Focus in Video

I plan to use my DSLR to shoot video at live events. How do I ascertain manual focus, while shooting on the move?
Akhilesh Sinha, Pune, via email

Accessories like LCD loupes and external monitors help you see the Live View in a larger, clearer way and thus help change focus on the fly.

Magnifying to confirm focus and using AF before starting video are effective ways to focus accurately when shooting static video, but for moving subjects, the only effective solution is a lot of practice. Invest in a monopod or a small video rig if you plan to do a lot of handheld video.