The link https://youtu.be/zi3pLOaUUXs takes you to a video of someone saying numbers and lots of barcodes flashing. Put this on playback speed x0.25, and scan each barcode, pausing when necessary.
You should get a list that looks like this:
```8PdGSTvnaY9zuPGubRMc7cyqggztfa6AqGoWfWwR7JwvAOM{Px4JIEbOEkws5NDuG4sOeb9chPBBYtfr8iwkHVYpcf7hVMGQe0xL3vBdLvZLbB2T3iNatxiU5kNLb_eoyi4AfAmLXyJo4oFE4iSJmP3ajdUBIXVe4oAQnoJxEV8SzMNoIa3j9aaIBHbqls2vsDNpidao1}gfkrtfrm```
The numbers that are being said, you will realise, are the same numbers as the ones at the start of each string above. So, take the first string and count 8 characters into the string. You get 'r'. Do this for each string and you can see where this goes...
`ractf{b4rc0d3_m4dn3ss}`