Mike:
Trademarks used for commercial purposes can require compensation to the trademark holder. Product placement in a film for example, is probably a paid-for license or is done with the mark holder's permission in return for showing the brand mark to a wide audience.
Next time you see a major league sports player endorsing a product, you may notice in many of them the sports figure is either not in uniform or is in a generic uniform that does not have the team logo...this avoids having to pay the major league for the use of the trademark symbol.
Bringing the question back to our interest here, a prominently displayed Mercedes symbol for commercial use might result in a demand to cease the use or to pay a licensing fee.
Here in the Big Apple, managers of several well known buildings (Empire State, Chrysler, and others) demand fees for using the building image prominently displayed in a photo or video for a commercial purpose.
You can pose Aunt Martha in front of Madison Square Garden but watch out if you use a tripod and a refector.
Richard M, NYC