Hi Christoph,
Yes, you can use the ZXing BarcodeReader within a SfPopup control by utilizing the ContentTemplate property of the popup. This allows you to include the ZXing BarcodeReader directly inside the popup's content. For more details on customizing the popup content, please refer to the following link
UG Link:
We have attached a sample for your reference.
Regards,
Sowntharya Jayamoorthy
Attachment:
Popup1_f84ff7c4.zip