Ok, I got to hear what you are talking about and your Grey is growling at you and telling you to back away.
You need to get a new cage as the one you have is not a parrot cage and is maybe about half the size that it needs to be, the only perch is a dowel which is bad for their feet and I did not see any toys for your bird.
Please understand that I do not mean to be rude and that these are simply my observations from your video and that I am offering them as a means of helping you to have a healthy and happy bird.
You have a Congo African Grey {CAG} as opposed to a Timneh African Grey (TAG), you named it Sunshine, do you know if it is a male or female? The video did not give me enough views to tell.
I would like to suggest that you change Sunshines diet to gloop, fresh veggies and fruit and a high quality seed mix. You would feed the gloop for breakfast along with some chopped veggies and a fruit, being sure to provide enough for all day nibbling and then feed the seed mix for dinner.
Your bird has no toys to keep it entertained when you are not able to be there with it. Toys can be as simple as some cardboard to tear up and destroy, or simple pieces of untreated pine wood for it to chew on. Most of the time the simplest way to get wood is to collect it from bushes and trees nearby to where you live. After making sure that the wood is safe for the bird first, you can usually ask for a cutting and most people will let you have one or two sticks suitable for toys or perches. Here is a link to a listing that includes information on safe and toxic plants and woods
viewtopic.php?f=8&t=12521 This is one of the better lists and begins on the second page of the thread.
The cage that you have is designed for birds like canaries, birds that do not spend time climbing you know this because the bars are all placed vertically. Birds that climb, like parrots need the bars placed horizontally although most cages today meant for parrots have two sides each of horizontal and vertical bars. Also the paint on the cage that you have will begin to chip very soon as it can't withstand the wear from the parrots beak. Due to the hazards of toxic paint and/or metal poisoning, I recommend that this be addressed right away. The larger cage will also help your bird to feel more comfortable.
From what I picked up when looking at your video, I gather that you may live in or near LA and if you do, there should be plenty of sources for used parrot cages, possibly check with a bird rescue or sanctuary as they may know where you can get a suitable cage for your bird or may be able to give you a good idea of where to look.
Now let's go to the bird. Greys hold a special place for me partly because the are wanted by so many people and are one of the most difficult birds to keep happy. The first thing that you need to understand is that parrots are not ever meant to be alone from the time that they hatch until the day that they die they are surrounded by their siblings, their parents, their mates, and their offspring as well as all the rest of their flock. This is even more important with Greys because of their emotional sensitivity, so the more time that you spend with your Grey interacting and talking to it the better it is. Right now your Grey does not like you so it is even more important that you set aside the time to tame and to bond with this bird. Start with several 15 minute sessions each day to sit and talk with your Grey. Start by looking into the room that the bird is in, note where the bird is and then enter the room. Just as soon as the bird starts to move from where it is stop and do not go any closer. Talk to the bird from this place at the end of 15 minutes say goodbye and leave. Do this every time you go to spend time with your bird and at some point you will end up right outside the front of the cage. Let me know when this happens and I will help you through the next steps. The more time that you can spend with your bird the better.