If you are requesting your own info, you do not need to file any consent form. However, if you do have any family members in your application, i.e. your spouse or your children, you will need to file a consent form to obtain their information, unless your application already has your as the representative authorised to obtain the their info.
This is because any person over the age of 16 has to give consent to obtain their information if it is being obtained any anyone else.
If you are the sole applicant, then just fill in the online form and submit it.
If you have your spouse, and children, then your spouse will have to sign the consent form, giving you the authorisation to obtain her info. If the form is not submitted, then your spouse's info will be redacted from your GCMS notes.
https://www.canada.ca/en/immigration-refugees-citizenship/corporate/transparency/access-information-privacy/forms/request-5744/new-constent-form.html