Dell Venue 8 (7840, Early 2015) - Manual (Page 7)

Features | 7
NOTE: The front camera supports zoom, but does not support
the face tracking, continuous auto‑focus, or touch‑to‑focus
feature.
NOTE: The Intel RealSense Snapshot supports continuous
auto‑focus, touch‑to‑focus, and zoom, but does not support the
face tracking feature.
NOTE: The micro‑USB/charging port supports connecting to a
computer and power sharing to connected USB devices.