Video is valuable when demonstrating a concept, procedure, or operation that's best conveyed visually. Adding learners to the classroom also reduces the time individuals might have to ask questions or make comments, and that's compounded if one participant dominates with questions and comments. Consider staying with a traditional model. In the optimal situation, learning takes place in the context of the work, but we know this isn't always possible. These issues require judgment calls.
Many employers use a learning lab where staff can work without interruption.
When a separate location isn't available, paying for overtime during quiet hours is another option. Assess the obstacles and find such alternatives as labs or extended workdays. People leave Web courses before finishing them for a variety of reasons. For example, it might be legitimate for people to extract just what they need from a lengthy course and drop the less relevant portions. But if demonstrating an ability to perform each course objective is integral to job success, participation must be attractive, easy, expected, and reinforced.