You can use XML attributes to set CodeScannerView parameters:
maskColor
maskVisible
frameColor
frameVisible
frameThickness
frameCornersSize
frameCornersRadius
frameCornersCapRounded
frameAspectRatioWidth
frameAspectRatioHeight
frameSize
frameVerticalBias
autoFocusButtonColor
autoFocusButtonVisible
autoFocusButtonPaddingHorizontal
autoFocusButtonPaddingVertical
autoFocusButtonOnIcon
autoFocusButtonOffIcon
autoFocusButtonPosition
flashButtonColor
flashButtonVisible
flashButtonPaddingHorizontal
flashButtonPaddingVertical
flashButtonOnIcon
flashButtonOffIcon
flashButtonPosition