Is there any build in UI for that kind of hardware like it exist in Modern UI for WiFi, Bluetooth, Broadband mobile and other common settings or I'm forced to use separate software (besides the obvious drivers for hardware)? The thing is that I have build-in fingerprint reader in my laptop and I have installed all necessary official drivers for it (and it looks like they are working fine, btw). But I did not find any UI settings where I could change Sign-in option from password/picture password/pin to fingerprint.
I used this offical driver (version 4.5.124.00) for my Validity VFS491 sensor (HP Elitebook 8570w). It supports native Windows 8.1 fingerprint enrollment.
Well, after digging
Firstly - all credits for the solution belong for Axel Foley with his awesome post Quick-guide for Validity fingerprint device drivers and SimplePass software Windows 7 and Windows 8 (only for HP Notebooks) on Notebookreview's forum.
The trick was (as always) with specific driver version (not even close to the latest!). In my case it was Validity WBF v18.104.22.168 by Validity. Note that the link to the driver is NOT from the official vendor, but from some third-party site (although this link IS from original Axel's post)! So, as always:
! Use it only on you own risk !
In short - yes, this was the only thing to do - reinstall driver for fingerprint hardware with just a few reboots between (re-)installation.
For the long answer I recommend to read the original post from Axel.
And finally - the screenshot below was acquired from my HP EliteBook 2760p with VFS471 sensor and v4.3.100 driver installed from the link above. So it may not work for other configurations.
PS. I believe this setting was there since Windows 8, unfortunately I did not find time to solve this issue with fingerprint until 8.1 preview. But now it is not relevant :)
Update: now even Fingerprint authentication API started working for me in Windows Store apps.