How would you go about recording the screen to display on small windows?

I am trying to figure out something for quite a while now and tried different things. Maybe someone here has a suggestion, even though i think there is no definite answer to my problem.

I record my whole screen and i record mostly text. The text is pretty small and made to be readable in full screen, but i want the user to be able to watch it in a small window. If you open a Youtube video and make the browser window smaller than fullscreen, the player turns pretty small -> i want my text to be readable there.
How would you go about this?

I tried zooming with Camtasia but that makes everything pretty "hectic" because i zoom in and out and pan left and right. Sometimes something on the left side is important, than on the right, than again on the left etc. etc. so everything becomes a bit confusing. I cant make the font bigger either. 
I guess there is no other option, i am just asking because maybe someone has an either that i didnt think about.