Create a video and implement to slides

Hi,

Say I create a course and I'd like to use a character that speaks and explains on certain slides. 

Of course, I am familiar with the characters available by Storyline itself, yet I would like to check for a possibility where I create my own speaking avatars (on a different program of course), with my voice and facial expressions as the instructor - and then implement it as a video within the relevant slides. 

Would that be possible in any way?

Thanks a lot!