I did some research into this.

First question: Who might have a UN plane parked in Canada?

Well, let's see if the UN has any companies it works with from Canada. I took a look at the page listing their Canadian contractors..

https://www.un.org/Depts/ptd/fr/contract-awards/343?field_date_3_value%5Bvalue%5D%5Byear%5D=2016&field_date_3_value_1%5Bvalue%5D%5Bmonth%5D=12&field_text_20_2_value=&field_country_tid_selective=1036&field_text_75_2_value=&field_commodity_group_ca_tid_selective=All&items_per_page=10

Alright, now I have a list of potential owners for that plane. Only two companies.

Second question: Do either of the two companies own a plane that looks like that one?

Well, I checked them out, and Voyaguer Airways seems own three different models of aircraft. One of them, the CRJ-200, seems to be a match for our UN aircraft in the video. So it seems this plane, based on the evidence so far, belongs to Voyageur Airways.

https://www.planespotters.net/airline/Voyageur-Airways

Third question: Why is a UN plane owned by Voyageur Airways in North Bay, Canada?

Well, let's look and see who Voyageur Airways actually is.

https://airways.voyav.com/

They're a charter company. Alright, but where is their headquarters location?

1500 Airport Road, North Bay, ON P1B 8G2 Canada

So what is the conclusion supported by the evidence so far?

This UN aircraft is a charter CRJ-200, owned by Voyageur Airways. The aircraft is currently parked at their headquarters in North Bay, Ontario, at the airport, which makes sense for a charter company. That is probably the airport where that plane lives, since the company is headquartered in that area and contracts with the UN for charter services.

EDIT: thanks to u/zeitreise

Go to the 14 minute point in this video to see the tail number of the aircraft:

https://www.youtube.com/watch?v=YA3Uwms5HW8

C-FXLH. Which is a CRJ-200 registered to the company mentioned above. This mystery appears to be solved. That plane lived there before the truckers ever arrived and, if UN troops are in Ontario, it's hard to use that plane as evidence of it.

I did some research into this.

First question: Who might have a UN plane parked in Canada?

Well, let's see if the UN has any companies it works with from Canada. I took a look at the page listing their Canadian contractors..

https://www.un.org/Depts/ptd/fr/contract-awards/343?field_date_3_value%5Bvalue%5D%5Byear%5D=2016&field_date_3_value_1%5Bvalue%5D%5Bmonth%5D=12&field_text_20_2_value=&field_country_tid_selective=1036&field_text_75_2_value=&field_commodity_group_ca_tid_selective=All&items_per_page=10

Alright, now I have a list of potential owners for that plane. Only two companies.

Second question: Do either of the two companies own a plane that looks like that one?

Well, I checked them out, and Voyaguer Airways seems own three different models of aircraft. One of them, the CRJ-200, seems to be a match for our UN aircraft in the video. So it seems this plane, based on the evidence so far, belongs to Voyageur Airways.

https://www.planespotters.net/airline/Voyageur-Airways

Third question: Why is a UN plane owned by Voyageur Airways in North Bay, Canada?

Well, let's look and see who Voyageur Airways actually is.

https://airways.voyav.com/

They're a charter company. Alright, but where is their headquarters location?

1500 Airport Road, North Bay, ON P1B 8G2 Canada

So what is the conclusion supported by the evidence so far?

This UN aircraft is a charter CRJ-200, owned by Voyageur Airways. The aircraft is currently parked at their headquarters in North Bay, Ontario, at the airport, which makes sense for a charter company. That is probably the airport where that plane lives, since the company is headquartered in that area and contracts with the UN for charter services.

I did some research into this.

First question: Who might have a UN plane parked in Canada?

Well, let's if the UN has any companies it works with from Canada. I took a look at the page listing their Canadian contractors..

https://www.un.org/Depts/ptd/fr/contract-awards/343?field_date_3_value%5Bvalue%5D%5Byear%5D=2016&field_date_3_value_1%5Bvalue%5D%5Bmonth%5D=12&field_text_20_2_value=&field_country_tid_selective=1036&field_text_75_2_value=&field_commodity_group_ca_tid_selective=All&items_per_page=10

Alright, now I have a list of potential owners for that plane. Only two companies.

Second question: Do either of the two companies own a plane that looks like that one?

Well, I checked them out, and Voyaguer Airways seems own three different models of aircraft. One of them, the CRJ-200, seems to be a match for our UN aircraft in the video. So it seems this plane, based on the evidence so far, belongs to Voyageur Airways.

https://www.planespotters.net/airline/Voyageur-Airways

Third question: Why is a UN plane owned by Voyageur Airways in North Bay, Canada?

Well, let's look and see who Voyageur Airways actually is.

https://airways.voyav.com/

They're a charter company. Alright, but where is their headquarters location?

1500 Airport Road, North Bay, ON P1B 8G2 Canada

So what is the conclusion supported by the evidence so far?

This UN aircraft is a charter CRJ-200, owned by Voyageur Airways. The aircraft is currently parked at their headquarters in North Bay, Ontario, at the airport, which makes sense for a charter company. That is probably the airport where that plane lives, since the company is headquartered in that area and contracts with the UN for charter services.