If anyone is interested, I asked my local embassy. They answer was
"In seeking to come to a decision on the visa application Migration officer takes into consideration factors such as the following: the applicant's ties to his/her country, employment, family ties, previous travel abroad, reasons for visiting Canada, etc. Please note that it is up to each applicant to provide sufficient proof, we do not advise potential applicants what documents they should submit in each individual case.
Also the Migration officer must be satisfied that the applicant has sufficient funds available to support his/her during the stay in Canada. We cannot give you a precise amount of money required because it depends on lifestyle, cost of living, accommodation, length of stay, etc. The Migration officer will most likely make a decision based on the documents/information provided by the applicant"
I also asked VAC(visa application centre) in my country. They answer was
"You can provide any supporting documents proving that you won't stay in Canada longer then you intended: property deed, marriage certificate, birth certificate etc"