The tire has fair amount of rubber left and that is good.
However, the first few seconds of the video shows what seemed like cracks near the bead. I can't make it out clearly as the video is so dark.
If it's not a crack and there is actually no visible damage to that area, then no worries. But if it is indeed cracks near the bead/rim, you need to stop using the tire and replace it immediately.
I also noticed a thread-like thing poking out of the tire at 0:29 of the video. Look like wire, I don't know for sure but if it's going into the tire, it probably punctured the tube. The ONLY way to be sure that is the case without taking your bike to the bike shop is you remove the tire from the rim yourself.
Important: note/mark/w/e the position of the pokey thing at 0:29 against the tube valve and against the rim and tube and tire if you decide to remove the tire yourself. You need to get to the same area in the tube as the area in the pokey thing in 0:29, also inspect the inside of the tire in that area. If there's is no puncture in that area. Get some air in the tube and immerse it in a basin full of water. If you found air bubbles coming out that's where your leak is and mark the leak. If you marked the tube against the tire and against the rim, then you'll know where the puncture in the tube is against the tire and the rim. Find these areas in the tire and rim, inspect these areas for anything that could have punctured the tube. Just to be sure, inspect the whole rim and inside of the tire to find anything that could puncture the tube.
patching the leak in the tube would be easy. I think in your case since you mentioned it deflates in a day. It's a slow leak. The hole would be small and you can simply seal it by pinching the tube at the hole until the hole opens up and then apply a very small drop of super glue (cyanoacrylate). Let dry overnight and you can use the next day.
