Youtube video to text to speach
Yes...possibly, if there is enough to sample from your existing video voice-overs but, as it's your voice, there's no reason to only use your videos as a source and the Acapela-Group, for example, has developed a Voice Factory for custom voice creation.

The main problem is that it will take time and money to do.

Try googling "text to speech sample my own voice" for other resources and methods and consider buying a quality text to speech application and quality sampled voice to use instead of your own. A quick Google of "high quality text to speech" will provide links to many options and demos.