Follow these step to add video to steemit.....
STEP #1 :-
Open video you want to upload to steemit
STEP # 2:-
Click on share button below the Video
STEP # 3:-
After clicking on share button > click on (Embed) buttom
STEP # 4:-
Copy the code you get after clicking the EMBED button
STEP # 5 :-
Now goto steemit.com & click on >Submit a story & the paste the EMBED
LAST STEP :-
ENJOY THIS VIDEO I JUST UPLOADED .....