Can you use a canon lens on a nikon body?

I want to purchase a Canon EF 50mm f/1.8 II Camera Lens, for my nikon d3300. Is there a type of adapter I could use for this? If so, would that effect the use of the camera?

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Best lenses to buy for Nikon D5200 for shooting movies/videos?

I just bought the Nikon D5200 for short films I tried using it with the stock lenses that came with it but the picture looked poorly. What video settings are best? What lenses should I buy? I m looking for sharpness that good quality feel. Not concern with the budget i can invest in a good one.

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APERTURE keeps changing AUTOMATICALLY on my Nikon D3300?

My camera is set on "close up" mode and my f numbers keep changin inevitably. I try to keep them in control but they keep getting high and low all by their own. What am I doing wrong?

P.S. I'm a beginner in photography (as you might've guessed by my camera model. Any other tips that can help me will be welcomed. Thanks in advanced.

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