Why are my videos blurry?

There are several reasons behind the video blur on your Android devices. You shoot a clip at high speed. Hence, the original videos are not clear themselves. You do not hold your mobile device properly while shooting a particular clip.

I agree that is why there is a cellphone holder. Or stick?

You can use both it depends on how you use your camera or even the angle.

I hate stick, I will be having a stiff neck