Yes, you can use video calling apps like WhatsApp or Google Duo on this phone and can enjoy video calling to your near and dear ones.
No. Moto C does not have the fingerprint sensor.
No. Motorola Moto C does not have hybrid sim slot. You can use 2 sim cards and 1 MicroSD slot at one go.
No. You can use only one sim card on 4G mode in this phone. You need to use 4G sim card in sim card slot one. Second slot shall use 2G sim card.