I've tried the different video resolutions (slo-mo, hd, fdh, uhd) but I can't send any of them in a text, it says they're too big. I'm using messaging+ so I'm not sure if that's the problem but I don't see any other settings for the videos - I can send pictures just fine.
I was also looking for a way to change the font color, instead of white, on the home screen and the lock screen.
To send video, you really need to create the video from within the attachment option in the message. That's the nature of video...it's just too large a file to send via MMS. As far as changing font color, I'm not aware of that ability since Verizon removed the LG Theme feature.