Not bad for a first effort at all.

As Seahorse suggests, get the camera on your head. You won't get the weird effects of vibrations, the lens will stay cleaner as well as getting a more "seat of your pants" view.

If you're going to tackle that sort of mud regularly, you are going to have to re-think your tyre choice!

(I've embedded your video too. Click edit on your OP and you'll see what I've done/how to do it for future reference.)

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