Movement during a webcast presentation can work very distracting. For example when you are using a virtual background and you start to move your arms, it may distort the background imaging.
Furthermore movement in the background, other persons or pets will have a distracting impact on your webcast presentation. People’s eyes are drawn to movement and therefore you should avoid having movement in the background of your webcast image as this will distract the attention of your audience from you to the background.