If you are using PR 1.1 then you can simply enable zoom during video recording.
Just create a file /etc/camera.conf and add the following lines:
recording-zoom = true
restart camera, enjoy and send postcards to the Harmattan camera team :)
I hope someone will create an Ovi store app for that ;)
If you care about the readability more than you care about the eye candy then that's for you ;-)
You need to enable developer mode and ssh to the N9.
# mkdir -p /usr/share/themes/blanco/meegotouch/libmessagingwidgets0/style/
# vi /usr/share/themes/blanco/meegotouch/libmessagingwidgets0/style/libmessagingwidgets0.css
Insert the following lines: