Default S5 fingerprint as password on app

Hi,

Tomorrow my Galaxy S5 will finally arrive. I've already watched a few unboxing and review videos. Now my question is, can you use the fingerprint to lock apps like Whatsapp and Twitter etc. ? I've seen an app called LastPass. In this app it is possible to use your fingerprint as a password but it costs 12$/year. Is there any developer who could make an app like this for free?

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DEVICE:
Samsung Galaxy S5

OLD DEVICES:
Samsung Galaxy Core (rooted)
Samsung Galaxy Xcover (rooted)
Samsung Galaxy S3


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