What level?
A D1 coach is first looking for a kid that can hit. Other levels may be more flexible.
If you are sending a video start with your hitting. The most reveling catching video is shot from the 1st base dugout showing technique, might want to show a couple of throws from behind the plate to show pop times. I am not sure I'd bother with throws to 1st or 3rd or covering bunts etc. Thus hitting, throws to 2nd and blocks. Preferably game film. Keep it short.