Videos that are professionally produced can be helpful as long as the work areas and type of work shown on the video is similar to those of your employees. Use real world examples from your facility - accident reports, photos from your company, video tape tours, do what ever you can to make the application of training meaningful to your workplaces. The trainer must make the trainees know that he is interested and believes in the program. Additionally, the trainer must convey the importance of the training to each employees own safety. Don t drag it out just to fill in the expected time.
Nobody likes to stare at a non-moving object.
Most people can t pull this off and make it seem natural. Let them know that you, the instructor, are in charge by your body language. Speak loud enough to be heard well by the back row. 5 minutes well spent to relax the participants. Your can use quiz results as proof that a worker knew the material immediately after the training.