The Olympus Stylus Tough TG-835 supports a maximum video resolution of 1920 x 1080 pixels. That's over two times the video resolution of a 1280 x 720 pixels digital camera, which is the most frequently found video resolution supported by cameras of this spec and age. 1280 x 720 pixels is also supported by this camera. A video resolution of 1920 x 1080 pixels is equivalent to Full HD video. You will require a Full HD TV or better to appreciate this level of detail.
A 1920 x 1080 pixels video resolutions is in fact the best supported video resolution amongst all waterproof cameras that were launched around the same time as this digital camera.
The worst supported video resolution across comparable types of camera is 320 x 240 pixels.