When you execute this search (without quotes), you are not hacking anything. You are simply asking Google to show you cameras that have been inadvertently left exposed to the public internet.
Here is what a typical result looks like:
http://192.168.1.108:81/view/index.shtml?CCTV&best inurl view index shtml cctv best
By clicking this link (with extreme caution), a user might see: When you execute this search (without quotes), you
Manufacturers often ship devices with default configurations that include remote web access enabled. Installers forget to: inurl view index shtml cctv best
Google’s web crawler (Googlebot) constantly scans the internet. When it finds a DVR’s web server publicly accessible, it indexes the index.shtml file and adds it to the search database.
If you are interested in the "best" publicly available CCTV feeds for legitimate purposes (weather monitoring, traffic watching, or tourism), there are legal alternatives to using the inurl hack.