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Chaley
In theory, absolutely. Pull out old seal and press in new one and maybe notch the corners for a neater finish.
In practice, unless they are damaged or obviously perished, I treat seal replacement as a last resort.
There's been so many different frames, with numerous different sized seals that aren't available anymore. Its often a hassle finding an available option which fits in the groove and provides enough compression for a good seal but not too much that the window won't close. There's often bits which were super glued into the groove, so removing that bit is problematic.
Some frames had the seal extruded as part of the frame, so they need cutting off all the way around and hopefully a good alternative works.
More often than not, draughts are down to failed hinges not pulling a casement window shut correctly, or tilt and turn windows needing adjusting/setting up correctly.
Edit. Watched the video ^
His window should definitely have a second seal around the edge of it, as he questions.
Don't start and finish in a corner. Start about half way along the top edge, and the finishing join is dear easy. The ends will stay inplace much better as well.