No, the D3200 does not have built-in Wi-Fi. Wireless connectivity requires the optional WU-1a Wireless Mobile Adapter.
Yes, it records Full HD 1080p video and features a 3.5mm external microphone jack, making it a solid choice for budget-friendly vlogging.
It uses the Nikon F-mount. For autofocus to work, you must use AF-S or AF-I lenses, as the body does not have an internal focus motor.
The EN-EL14 battery provides approximately 540 shots per charge based on CIPA standards.