Usually casual articles don't require you to mention trademarks. However if you are using any brand in the images, video and article that handles some legal talk then at the end of the article, you'd need to mention about it. For example, if you write about Windows operating system, at the bottom of your website, it helps to write something like "Windows is trademark of Microsoft and this site has no affiliation with it". As you can see this definitely helps in many ways. This way you can bee in compliance for using the names in legal way. And you can have no issues with the brands and their trademarks. Such disclosure surely helps to set things straight as far as the article legal stand point is concerned.