That sounds like a lot of fun!!!
If you are going to play in a league I wouldn't worry at all about velocity. Work on consistency with hitting your spots, changing speeds and throwing strikes. Always try to work ahead in the count... you have to be in a "zone" when on the mound. Pitching is such a mental "game" and you can not allow anything to get you "rattled".
If you want to see how hard you throw just for fun look at your videos and look at the moving "parts". Your body moves most efficiently at 90 degree angles. What I mean is your shoulders should move at a 90 degree angle to your spine, your throwing elbow should be 90 degrees to your shoulders... it appears your throwing elbow is below your right shoulder. It also appears as if you have too much rotational movement too early... when you are balanced on your right leg with your left leg raised imagine driving your left hip straight at home plate as your first move... you want to create separation between when your hips rotate open and when your shoulders rotate open. This will create tension in your torso that will help you gain more velocity. Of course, that is just my unprofessional opinion and observations...
I played many years ago... video analysis was scarce back then so everything was done based on feel and advice of a pitching coach. Everyone responds differently to the same advice given. I recently began studying the pitching motion just to try to help out my son... it is really amazing just how much can be learned with a little study.