They have also become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.
Perhaps Batman would pick up this videolink to talk with citizens of Gotham: https://videolink2.me/batman Thats how all people see page of Batman: So in case of emergency anybody can just talk with Batman via videolink instead of using old school spotlight.
Webcams can be used to take video clips and still pictures.
Various software tools in wide use can be employed for this, such as Pic Master (for use with Windows operating systems), Photo Booth (Mac), or Cheese (with Unix systems).
Video features, including faces, shapes, models and colors can be observed and tracked to produce a corresponding form of control.
For example, the position of a single light source can be tracked and used to emulate a mouse pointer, a head-mounted light would enable hands-free computing and would greatly improve computer accessibility.