Acting on video requires the exact same commitment at a live audition. You have to be completely prepared. Consider these pointers when filming your audition. 

Slate (the intro)
The slate for a theatre video monologue audition is the INTRODUCTION. You'll find a post in the instructions about that. Just the information that's needed is fine. When you upload it will ask for a description, be sure to enter your name there. 

How should I be framed?
You should be close enough to the camera that it cuts off just above your head and someplace appropriate on your chest, under your rib cage usually works.  That's called a medium shot. 

Moving and Looking?
Hold still, you don't want to leave the frame or make us sea sick! Keep your eyes focused to the side or above and beyond the camera. Don't look into the lens of the camera and if you're using a phone, DON'T WATCH YOURSELF! Use the rear facing camera and either delay the start, walk into the frame or have a buddy start it. 

What to wear?
Be clean and tidy and compliment your self with nice colors. You don't need nor should you dress like the character you're playing. 

Where to perform?
It's best to perform against a blank wall that's facing a window. You want to be facing the light. Overhead light is not good as it causes weird shadows. Artificial light is ok, but you do have ALL day to film so try the window approach. 

To edit or not to edit?
Please don't edit. You can trim the beginning and end so that it starts with your introduction and ends with you exhaling and letting the character turn back to you and saying thank you. But PLEASE don't make it an over edited production. 

Every monologue in every type of audition starts with an introduction. This should be all about WHO YOU ARE. Be yourself and relax. Deliver your introduction using these exact words and you'll have a successful audition. After you introduce yourself, take a breathe, exhale and become your character. 

Good TIME OF DAY
I am SAY YOUR NAME
and will play SAY THE CHARACTER'S NAME
from AUTHOR'S NAME (POSSESSIVE)
TITLE OF PLAY

Example

Good afternoon, 
I am Kelvin Moon
and will play Albus Potter
from J.K. Rowling's 
Harry Potter and the Cursed Child