Lots of good things: grip is reasonable, technique is a good starting point etc. What you currently need to learn is how to take the shuttle:
1. higher
2. in front of you
Your contact is currently very low (as others mentioned regarding your "jump"), but it applies to your whole body - you want your strike to feel like you have extended every aspect of your body. The shuttle is also not far enough in front of your body - its really easy to tell because your whole body is leaning to the left as you hit and after you hit the shuttle.
Whilst these two things are really simple to say, they are not easy to do as well as possible without a coach or good spotter, only because when you think you are behind the shuttle as far as you need to be, or reaching as high as you can, you are probably still going to have plenty of room for improvement - your current contact point is a habit. I would suggest you really strive for something completely different - get the contact point at least 1 metre higher and further in front. When trying to do this, you will begin to feel what a proper smash feels like. When you think you have improved, try AGAIN to get it even higher and even further in front - you want to be reaching out in front of you at least 1 or 2 metres to play this shot.
I highly recommend you don't jump for shuttle (for at least a few good dedicated months of practice) - your feet may come off the floor as a result of you reaching forwards and upwards so much, and needing to keep your balance, but don't try to jump - just try to reach the shuttle higher! Really - jumping will just confuse your contact point so much. Learn it on the floor, and you will easily hit a great jump smash. But trying to jump whilst learning will just slow down your progress for all shots.
When you want more feedback, please upload another video
Good luck!