Yes, I’ve uploaded the video I want to my content folder, yes I’ve created a media player which plays that video, yes I’ve applied the texture to the material and yes I’ve put it in the sequencer. I set the media source binding ID to the camera I want viewing the texture on the media track in the sequencer, I set the media texture to the texture I want viewed on the media track in the properties section, I exported the video in the same resolution as the render in my project, I set pre-roll frames and yes, I made sure the frame range is in the desired set of frames.
Why should this be so difficult?