Hello
My cousin is in Canada with Tourist Visa 5 month there
He wants to extend his stay in order to stay 6 other months
Can he extend his stay, or what does he need to do this?
Highly unusual for a young person to be able to have the funds to be able to not work for a year and live in another country. Is this a family member or a relationship? Anticipate your cousin will have to show that he/she has enough savings so they can support themself. Also prepare for a chance that the extension could be refused.
I'm not sure what you mean by "enter LMIA". The LMIA is something his employer must obtain. This is a 4-6 months process. He cannot work until after his employer has obtained an approved LMIA and until after he has received an approved work permit based on that LMIA.
Generally speaking, it's next to impossible to find employers willing to go through the LMIA process since it's long and expensive with no guarantee of approval.