Considering that it may take you 1 day to find a suitable freelancer to take over the project, having them understand the presentation style, idea and so forth will take you another 1-2 days. He/she will have to send you their version then you review it before sending it to the client.
Like photography, anyone can do a screen cast video- all they need to have is a computer installed with a screen-casting software and headphones with microphone to record their voice-Period!
So, how can you make this a business if anyone can do it? Who will pay for a such service?
If you do good job, you will probably get results which means more money. That 'more money' part is very exciting to many. But if you are not careful, it is very dangerous. Money is good. It's thrilling when you know you are getting paid to do what you love.