You said "cell". "Cell" means tables. Tables mean you are using outdated coding techniques for layouts. With that said, you can re-size the video or enlarge the web page. Can't tell you which is a better option as you gave nothing to work with.
As for positioning any element like the flash, use the CSS positioning properties.
Tx Payne. i have changed the layouts to div. The problem is with the expandable flash in my page. On roll over , the flash expands and it displays correctly but on roll out , the flash ad aligns to the left corner of the div instead of the right corner. How to align the flash ad to the right corner of the div