Hello Xishan:
In the US, for installers and technicians, there is no single (national) certification required but individual states or market verticals may require licensure.
I think the typical approach for implementing these requirements involve occupational trade organizations (alarm associations, low voltage contractors, etc) petitioning and lobbying for state governments to pass these requirements into law.
However, especially in the US, laws must include some provision for enforcement or they are ignored. In many areas, technician/company licensure is sign that "I voluntarily commit myself to retaining this license' but a law enforcement body that 'cracks down' on violators is almost unheard of. Licensure is a self-policing requirement driven by customers asking for it, not government demanding it.
Usually enforcement comes in the form of code inspectors responsible for maintaining the safety and workmanship of installed systems, not the certification status of installing companies.
For access control where life/safety is at stake, these inspections are common. However for video surveillance (that does not typically endanger life if installed poorly), this is much less common.
It is a good question without a clear answer. Does this help?