There is not a limitation per se, except the jig markers need to be big enough from the point of view of the camera.
Either the camera needs to be close enough, or if the camera is farther away - the printed markers should be printed in a large format.
The best way to know if simply to print a marker and place it on an object, and then moving the camera.
In the Camera Configuration screen, after you’ve enabled the Jig Detector, you will see a blue marking over the marker if it’s successfully picked up. If it’s too far away - the blue marking will not appear.
In regards to the built-in camera - for most PCs the built-in webcam should work.
However, we do not support Vision on mobile devices yet (unless they are Windows 10 64bit devices), such as Android or iOS. Mind, non-Vision Tulip is available on Android, and can use the phone’s camera for barcode scanning.