Brainstorm a list of types of businesses that use training videos. A few off the top of my head that I know of are insurance companies and manufacturing/industry. You also might try the Human Resources departments of corporations - you could cold call them and ask if they use training videos in house, and if so, who should you talk to about them. Also, a list broker could help you reach your target market. For instance, could request mailing lists for companies that have bought videography services in the past. Then target a direct mail campaign at those folks.