I don’t remember off top of my head what does the URL parameter ?s=50 mean in your camera url example, but you can use the w parameter to set the video width and size like the example below:
The other trick I found helpful for Blue Iris is to combine multiple cameras in a group, and display the group in one media tile. See the post below for the example that I put 4 cameras into a “outdoor” group, and use the specific URL to access the grouped camera feeds in one media tile.