Research the options for film schools that offer training in videography. You can find lists of film schools through various resources, including filmschools.com or Education-Portal.com (See Resources).
Research each film school you're considering. The program you choose should have an option to concentrate on videography.
Apply to the film school programs that offer the most videography training. Film schools will require a detailed application, but all have different sets of requirements. Work with an admissions advisor at each school.
Take advantage of hands-on projects that are assigned once you start taking courses. Use the videos you create as part of your portfolio to show prospective employers and clients your skills as a videographer.