The Sony a7iii is a great camera for both video and stills. It features 4K video and incredible auto-focus capabilities. These are the a7iii video settings that I use to control depth-of-field. To create a7iii videos with bokeh, this is how I do it. Available on Amazon.com - Sony a7 III Full-Frame Mirrorless Interchangeable-Lens
This is how to understand manual focus for video. By utilizing manual focus, the "professional look" can be achieved with video. Defocused background, also commonly referred to as "bokeh," is just one of the many advantages of using manual focus for video.