Not a bad start man. To help eliminate the stiffness in your movements, try this drill: Approach an obstacle and vault it with as little hesitation as possible. Try to minimize any stuttering or bobbing you may do before the vault (see 0:21-0:22 in your video). Once you're comfortable with that, try linking it to another movement such as precision jump to vault with as little hesitation as possible and so on.
Also, PLEASE do not try any flips or acrobatics of any sort until you can do it safely. Even if you don't have a gym around, at least try finding someone with experience in tumbling or tricking that can help you. Anyways, best of luck and keep on training your heart out.