Hallo Bracca,
please don’t post the video as it could provide info about bruteforcing software.
Bruteforcing can be usually prevented using strong passwords.
In case of Wireless LAN, most of old router used a protection named WEP that could be bypassed with little effort.
Nowadays routers and wifi NICs use WPA or WPA2 Security with TKIP or AES Encryption. These settings and a strong password could reduce the risks of security breaches.
Ref: WPA Security Tips