How to get photos and videos from my damaged iPhone?

Can't be powered on at all what I'm holding is just a hardware!

No power, then you can't get from the phone itself. Do you have iCloud set up? You can restore iCloud backup to another device and maybe get some back. Any chance an iTunes backup recent? That's best bet. You have to get power to it or those are the only two options you have. Best luck.

If your computer can still recognize your iPhone drive when you plug it in, you may try this data recovery software. It can scan the photos and videos on your iPhone and return a file list, then you can choose the files to recovery. If your computer can't find the iPhone, sorry, I can't help. You may need to take the iPhone to Apple Store for help.