Yes. To add your own custom branding, you first need to remove the VWO branding by clicking on the Remove VWO branding checkbox. Then you need to upload your logo of exactly 320 x 100 pixels in size.
This will replace VWO branding with your custom logo and appears in the survey window. For the duration of the public beta, this feature is available for all accounts. After public beta ends, this feature may or may not be available in all plans.