The short answer is - it is not currently easy. Before purchasing any
softwar, be sure to read reviews and test with the trial version as the
results may not be what you are hoping for.
If budget is not an issue, check into OfficeFX's Pro version
(www.instanteffects.com) it has a great export to video feature which I use
for client projects quite often. But the price tag is a bit high for just
that one feature.