You can allow users to scan QR or barcodes within a portal or interface to search for existing records. This can be activated by going to:
The table's settings
User Actions section
Make sure Search bar is enabled
Turn on Allow QR code scanning to find records
Now, a camera icon will appear in the search bar. Clicking it will bring up the device's camera ready to scan the code. Once scanned, the view will be filtered to only show matching records.